diff --git a/CMakeLists.txt b/CMakeLists.txt
index df05952be..f44b7caef 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -117,6 +117,7 @@ option(REVISION_FROM_GIT "Get revision using `git rev-parse`" ON)
 option(NO_UPDATE_CHECK "Disable automatic checking for new application updates" OFF)
 option(IS_FLATPAK_BUILD "Set to 'ON' when building RSS Guard with Flatpak." OFF)
 option(FORCE_BUNDLE_ICONS "Forcibly bundle icon themes into RSS Guard." OFF)
+option(ENABLE_COMPRESSED_SITEMAP "Enable support for gzip-compressed sitemap feeds. Requires zlib." OFF)
 
 # Import Qt libraries.
 set(QT6_MIN_VERSION 6.3.0)
diff --git a/src/librssguard/3rd-party/qcompressor/qcompressor.cpp b/src/librssguard/3rd-party/qcompressor/qcompressor.cpp
new file mode 100644
index 000000000..458258864
--- /dev/null
+++ b/src/librssguard/3rd-party/qcompressor/qcompressor.cpp
@@ -0,0 +1,196 @@
+#include "qcompressor.h"
+
+/**
+ * @brief Compresses the given buffer using the standard GZIP algorithm
+ * @param input The buffer to be compressed
+ * @param output The result of the compression
+ * @param level The compression level to be used (@c 0 = no compression, @c 9 = max, @c -1 = default)
+ * @return @c true if the compression was successful, @c false otherwise
+ */
+bool QCompressor::gzipCompress(QByteArray input, QByteArray &output, int level)
+{
+    // Prepare output
+    output.clear();
+
+    // Is there something to do?
+    if(input.length())
+    {
+        // Declare vars
+        int flush = 0;
+
+        // Prepare deflater status
+        z_stream strm;
+        strm.zalloc = Z_NULL;
+        strm.zfree = Z_NULL;
+        strm.opaque = Z_NULL;
+        strm.avail_in = 0;
+        strm.next_in = Z_NULL;
+
+        // Initialize deflater
+        int ret = deflateInit2(&strm, qMax(-1, qMin(9, level)), Z_DEFLATED, GZIP_WINDOWS_BIT, 8, Z_DEFAULT_STRATEGY);
+
+        if (ret != Z_OK)
+            return(false);
+
+        // Prepare output
+        output.clear();
+
+        // Extract pointer to input data
+        char *input_data = input.data();
+        int input_data_left = input.length();
+
+        // Compress data until available
+        do {
+            // Determine current chunk size
+            int chunk_size = qMin(GZIP_CHUNK_SIZE, input_data_left);
+
+            // Set deflater references
+            strm.next_in = (unsigned char*)input_data;
+            strm.avail_in = chunk_size;
+
+            // Update interval variables
+            input_data += chunk_size;
+            input_data_left -= chunk_size;
+
+            // Determine if it is the last chunk
+            flush = (input_data_left <= 0 ? Z_FINISH : Z_NO_FLUSH);
+
+            // Deflate chunk and cumulate output
+            do {
+
+                // Declare vars
+                char out[GZIP_CHUNK_SIZE];
+
+                // Set deflater references
+                strm.next_out = (unsigned char*)out;
+                strm.avail_out = GZIP_CHUNK_SIZE;
+
+                // Try to deflate chunk
+                ret = deflate(&strm, flush);
+
+                // Check errors
+                if(ret == Z_STREAM_ERROR)
+                {
+                    // Clean-up
+                    deflateEnd(&strm);
+
+                    // Return
+                    return(false);
+                }
+
+                // Determine compressed size
+                int have = (GZIP_CHUNK_SIZE - strm.avail_out);
+
+                // Cumulate result
+                if(have > 0)
+                    output.append((char*)out, have);
+
+            } while (strm.avail_out == 0);
+
+        } while (flush != Z_FINISH);
+
+        // Clean-up
+        (void)deflateEnd(&strm);
+
+        // Return
+        return(ret == Z_STREAM_END);
+    }
+    else
+        return(true);
+}
+
+/**
+ * @brief Decompresses the given buffer using the standard GZIP algorithm
+ * @param input The buffer to be decompressed
+ * @param output The result of the decompression
+ * @return @c true if the decompression was successfull, @c false otherwise
+ */
+bool QCompressor::gzipDecompress(QByteArray input, QByteArray &output)
+{
+    // Prepare output
+    output.clear();
+
+    // Is there something to do?
+    if(input.length() > 0)
+    {
+        // Prepare inflater status
+        z_stream strm;
+        strm.zalloc = Z_NULL;
+        strm.zfree = Z_NULL;
+        strm.opaque = Z_NULL;
+        strm.avail_in = 0;
+        strm.next_in = Z_NULL;
+
+        // Initialize inflater
+        int ret = inflateInit2(&strm, GZIP_WINDOWS_BIT);
+
+        if (ret != Z_OK)
+            return(false);
+
+        // Extract pointer to input data
+        char *input_data = input.data();
+        int input_data_left = input.length();
+
+        // Decompress data until available
+        do {
+            // Determine current chunk size
+            int chunk_size = qMin(GZIP_CHUNK_SIZE, input_data_left);
+
+            // Check for termination
+            if(chunk_size <= 0)
+                break;
+
+            // Set inflater references
+            strm.next_in = (unsigned char*)input_data;
+            strm.avail_in = chunk_size;
+
+            // Update interval variables
+            input_data += chunk_size;
+            input_data_left -= chunk_size;
+
+            // Inflate chunk and cumulate output
+            do {
+
+                // Declare vars
+                char out[GZIP_CHUNK_SIZE];
+
+                // Set inflater references
+                strm.next_out = (unsigned char*)out;
+                strm.avail_out = GZIP_CHUNK_SIZE;
+
+                // Try to inflate chunk
+                ret = inflate(&strm, Z_NO_FLUSH);
+
+                switch (ret) {
+                case Z_NEED_DICT:
+                    ret = Z_DATA_ERROR;
+                case Z_DATA_ERROR:
+                case Z_MEM_ERROR:
+                case Z_STREAM_ERROR:
+                    // Clean-up
+                    inflateEnd(&strm);
+
+                    // Return
+                    return(false);
+                }
+
+                // Determine decompressed size
+                int have = (GZIP_CHUNK_SIZE - strm.avail_out);
+
+                // Cumulate result
+                if(have > 0)
+                    output.append((char*)out, have);
+
+            } while (strm.avail_out == 0);
+
+        } while (ret != Z_STREAM_END);
+
+        // Clean-up
+        inflateEnd(&strm);
+
+        // Return
+        return (ret == Z_STREAM_END);
+    }
+    else
+        return(true);
+}
\ No newline at end of file
diff --git a/src/librssguard/3rd-party/qcompressor/qcompressor.h b/src/librssguard/3rd-party/qcompressor/qcompressor.h
new file mode 100644
index 000000000..a620eddfc
--- /dev/null
+++ b/src/librssguard/3rd-party/qcompressor/qcompressor.h
@@ -0,0 +1,17 @@
+#ifndef QCOMPRESSOR_H
+#define QCOMPRESSOR_H
+
+#include <zlib.h>
+#include <QByteArray>
+
+#define GZIP_WINDOWS_BIT 15 + 16
+#define GZIP_CHUNK_SIZE 32 * 1024
+
+class QCompressor
+{
+public:
+    static bool gzipCompress(QByteArray input, QByteArray &output, int level = -1);
+    static bool gzipDecompress(QByteArray input, QByteArray &output);
+};
+
+#endif // QCOMPRESSOR_H
diff --git a/src/librssguard/CMakeLists.txt b/src/librssguard/CMakeLists.txt
index f6afa971d..bd8dcfdec 100644
--- a/src/librssguard/CMakeLists.txt
+++ b/src/librssguard/CMakeLists.txt
@@ -49,6 +49,8 @@ set(SOURCES
   dynamic-shortcuts/shortcutcatcher.h
   exceptions/applicationexception.cpp
   exceptions/applicationexception.h
+  exceptions/feedrecognizedbutfailedexception.cpp
+  exceptions/feedrecognizedbutfailedexception.h
   exceptions/feedfetchexception.cpp
   exceptions/feedfetchexception.h
   exceptions/filteringexception.cpp
@@ -383,6 +385,8 @@ set(SOURCES
   services/standard/parsers/rdfparser.h
   services/standard/parsers/rssparser.cpp
   services/standard/parsers/rssparser.h
+  services/standard/parsers/sitemapparser.cpp
+  services/standard/parsers/sitemapparser.h
   services/standard/standardcategory.cpp
   services/standard/standardcategory.h
   services/standard/standardfeed.cpp
@@ -536,9 +540,26 @@ else()
     3rd-party/sqlite/sqlite3.h
   )
 
-  SET(CMAKE_C_FLAGS  "${CMAKE_C_FLAGS} -DSQLITE_THREADSAFE=1 -DSQLITE_ENABLE_COLUMN_METADATA=1")
+  set(CMAKE_C_FLAGS  "${CMAKE_C_FLAGS} -DSQLITE_THREADSAFE=1 -DSQLITE_ENABLE_COLUMN_METADATA=1")
 endif()
 
+# Add ZLIB.
+set(ZLIB_ROOT "c:\\Users\\rotter\\Downloads\\zlib-1.3")
+
+if(ENABLE_COMPRESSED_SITEMAP)
+  find_package(ZLIB REQUIRED)
+
+  # Add qcompressor.
+  list(APPEND SOURCES
+    3rd-party/qcompressor/qcompressor.cpp
+    3rd-party/qcompressor/qcompressor.h
+  )
+endif(ENABLE_COMPRESSED_SITEMAP)
+
+if(ZLIB_FOUND)
+  message(STATUS "Using system zlib ${ZLIB_VERSION_STRING}.")
+endif(ZLIB_FOUND)
+
 # Add SimpleCrypt.
 list(APPEND SOURCES
   3rd-party/sc/simplecrypt.cpp
@@ -676,6 +697,23 @@ if(SQLite3_FOUND)
   )
 endif()
 
+if(ZLIB_FOUND)
+  target_include_directories(rssguard AFTER
+    PRIVATE
+    ${ZLIB_INCLUDE_DIRS}
+  )
+
+  target_compile_definitions(rssguard
+    PRIVATE
+
+    ENABLE_COMPRESSED_SITEMAP
+  )
+
+  target_link_libraries(rssguard PRIVATE
+    ${ZLIB_LIBRARIES}
+  )
+endif(ZLIB_FOUND)
+
 # Qt.
 target_link_libraries(rssguard PUBLIC
   Qt${QT_VERSION_MAJOR}::Core
diff --git a/src/librssguard/definitions/typedefs.h b/src/librssguard/definitions/typedefs.h
index 73e13d1ba..89c5de546 100644
--- a/src/librssguard/definitions/typedefs.h
+++ b/src/librssguard/definitions/typedefs.h
@@ -24,4 +24,12 @@ struct UpdatedArticles {
     QList<Message> m_all;
 };
 
+struct IconLocation {
+    QString m_url;
+
+    // The "bool" if true means that the URL is direct and download directly, if false then
+    // only use its domain and download via 3rd-party service.
+    bool m_isDirect;
+};
+
 #endif // TYPEDEFS_H
diff --git a/src/librssguard/exceptions/feedfetchexception.cpp b/src/librssguard/exceptions/feedfetchexception.cpp
index 844b83e7a..36fd1b87f 100644
--- a/src/librssguard/exceptions/feedfetchexception.cpp
+++ b/src/librssguard/exceptions/feedfetchexception.cpp
@@ -2,7 +2,7 @@
 
 #include "exceptions/feedfetchexception.h"
 
-FeedFetchException::FeedFetchException(Feed::Status feed_status, QString message)
+FeedFetchException::FeedFetchException(Feed::Status feed_status, const QString& message)
   : ApplicationException(message), m_feedStatus(feed_status) {}
 
 Feed::Status FeedFetchException::feedStatus() const {
diff --git a/src/librssguard/exceptions/feedfetchexception.h b/src/librssguard/exceptions/feedfetchexception.h
index 961daeb64..ca7110fd7 100644
--- a/src/librssguard/exceptions/feedfetchexception.h
+++ b/src/librssguard/exceptions/feedfetchexception.h
@@ -8,7 +8,7 @@
 
 class FeedFetchException : public ApplicationException {
   public:
-    explicit FeedFetchException(Feed::Status feed_status, QString message = {});
+    explicit FeedFetchException(Feed::Status feed_status, const QString& message = {});
 
     Feed::Status feedStatus() const;
 
diff --git a/src/librssguard/exceptions/feedrecognizedbutfailedexception.cpp b/src/librssguard/exceptions/feedrecognizedbutfailedexception.cpp
new file mode 100644
index 000000000..50762e80c
--- /dev/null
+++ b/src/librssguard/exceptions/feedrecognizedbutfailedexception.cpp
@@ -0,0 +1,5 @@
+// For license of this file, see <project-root-folder>/LICENSE.md.
+
+#include "exceptions/feedrecognizedbutfailedexception.h"
+
+FeedRecognizedButFailedException::FeedRecognizedButFailedException(const QString &message) : ApplicationException(message) {}
diff --git a/src/librssguard/exceptions/feedrecognizedbutfailedexception.h b/src/librssguard/exceptions/feedrecognizedbutfailedexception.h
new file mode 100644
index 000000000..71f8d65f5
--- /dev/null
+++ b/src/librssguard/exceptions/feedrecognizedbutfailedexception.h
@@ -0,0 +1,13 @@
+// For license of this file, see <project-root-folder>/LICENSE.md.
+
+#ifndef UNRECOGNIZEDFEEDFORMATEXCEPTION_H
+#define UNRECOGNIZEDFEEDFORMATEXCEPTION_H
+
+#include "exceptions/applicationexception.h"
+
+class FeedRecognizedButFailedException : public ApplicationException {
+  public:
+    explicit FeedRecognizedButFailedException(const QString& message = {});
+};
+
+#endif // UNRECOGNIZEDFEEDFORMATEXCEPTION_H
diff --git a/src/librssguard/exceptions/scriptexception.cpp b/src/librssguard/exceptions/scriptexception.cpp
index 2d68fcc20..98cf77681 100644
--- a/src/librssguard/exceptions/scriptexception.cpp
+++ b/src/librssguard/exceptions/scriptexception.cpp
@@ -4,12 +4,12 @@
 
 #include "definitions/definitions.h"
 
-ScriptException::ScriptException(Reason reason, QString message) : ApplicationException(message), m_reason(reason) {
+ScriptException::ScriptException(Reason reason, const QString& message)
+  : ApplicationException(message), m_reason(reason) {
   if (message.isEmpty()) {
     setMessage(messageForReason(reason));
   }
-  else if (reason == ScriptException::Reason::InterpreterError ||
-           reason == ScriptException::Reason::OtherError) {
+  else if (reason == ScriptException::Reason::InterpreterError || reason == ScriptException::Reason::OtherError) {
     setMessage(messageForReason(reason) + QSL(": '%1'").arg(message));
   }
 }
diff --git a/src/librssguard/exceptions/scriptexception.h b/src/librssguard/exceptions/scriptexception.h
index 0ef1f4caa..093dafce4 100644
--- a/src/librssguard/exceptions/scriptexception.h
+++ b/src/librssguard/exceptions/scriptexception.h
@@ -8,7 +8,7 @@
 #include <QCoreApplication>
 
 class ScriptException : public ApplicationException {
-  Q_DECLARE_TR_FUNCTIONS(ScriptException)
+    Q_DECLARE_TR_FUNCTIONS(ScriptException)
 
   public:
     enum class Reason {
@@ -19,7 +19,7 @@ class ScriptException : public ApplicationException {
       OtherError
     };
 
-    explicit ScriptException(Reason reason = Reason::OtherError, QString message = QString());
+    explicit ScriptException(Reason reason = Reason::OtherError, const QString& message = QString());
 
     Reason reason() const;
 
diff --git a/src/librssguard/gui/notifications/articlelistnotification.h b/src/librssguard/gui/notifications/articlelistnotification.h
index c37fe8c29..c7a2e6b2d 100644
--- a/src/librssguard/gui/notifications/articlelistnotification.h
+++ b/src/librssguard/gui/notifications/articlelistnotification.h
@@ -29,9 +29,9 @@ class ArticleListNotification : public BaseToastNotification {
 
   private slots:
     void openArticleInArticleList();
+    void openArticleInWebBrowser();
     void onMessageSelected(const QModelIndex& current, const QModelIndex& previous);
     void showFeed(int index);
-    void openArticleInWebBrowser();
     void markAllRead();
 
   private:
diff --git a/src/librssguard/network-web/networkfactory.cpp b/src/librssguard/network-web/networkfactory.cpp
index f99d644d9..875180a21 100644
--- a/src/librssguard/network-web/networkfactory.cpp
+++ b/src/librssguard/network-web/networkfactory.cpp
@@ -160,7 +160,7 @@ QString NetworkFactory::sanitizeUrl(const QString& url) {
   return QString(url).replace(QRegularExpression(QSL("[^\\w\\-.~:\\/?#\\[\\]@!$&'()*+,;=% \\|]")), {});
 }
 
-QNetworkReply::NetworkError NetworkFactory::downloadIcon(const QList<QPair<QString, bool>>& urls,
+QNetworkReply::NetworkError NetworkFactory::downloadIcon(const QList<IconLocation>& urls,
                                                          int timeout,
                                                          QPixmap& output,
                                                          const QList<QPair<QByteArray, QByteArray>>& additional_headers,
@@ -168,15 +168,15 @@ QNetworkReply::NetworkError NetworkFactory::downloadIcon(const QList<QPair<QStri
   QNetworkReply::NetworkError network_result = QNetworkReply::NetworkError::UnknownNetworkError;
 
   for (const auto& url : urls) {
-    if (url.first.isEmpty()) {
+    if (url.m_url.isEmpty()) {
       continue;
     }
 
     QByteArray icon_data;
 
-    if (url.second) {
+    if (url.m_isDirect) {
       // Download directly.
-      network_result = performNetworkOperation(url.first,
+      network_result = performNetworkOperation(url.m_url,
                                                timeout,
                                                {},
                                                icon_data,
@@ -206,7 +206,7 @@ QNetworkReply::NetworkError NetworkFactory::downloadIcon(const QList<QPair<QStri
     }
     else {
       // Duck Duck Go.
-      QUrl url_full = QUrl(url.first);
+      QUrl url_full = QUrl(url.m_url);
       QString host = url_full.host();
 
       if (host.startsWith(QSL("www."))) {
diff --git a/src/librssguard/network-web/networkfactory.h b/src/librssguard/network-web/networkfactory.h
index 211ae86a7..17a8ec112 100644
--- a/src/librssguard/network-web/networkfactory.h
+++ b/src/librssguard/network-web/networkfactory.h
@@ -5,6 +5,7 @@
 
 #include "network-web/httpresponse.h"
 
+#include "definitions/typedefs.h"
 #include "services/abstract/feed.h"
 
 #include <QCoreApplication>
@@ -38,7 +39,11 @@ class NetworkFactory {
     explicit NetworkFactory() = default;
 
   public:
-    enum class NetworkAuthentication { NoAuthentication = 0, Basic = 1, Token = 2 };
+    enum class NetworkAuthentication {
+      NoAuthentication = 0,
+      Basic = 1,
+      Token = 2
+    };
 
     static QStringList extractFeedLinksFromHtmlPage(const QUrl& url, const QString& html);
     static QPair<QByteArray, QByteArray> generateBasicAuthHeader(NetworkAuthentication protection,
@@ -51,7 +56,7 @@ class NetworkFactory {
 
     // Performs SYNCHRONOUS favicon download for the site,
     // given URL belongs to.
-    static QNetworkReply::NetworkError downloadIcon(const QList<QPair<QString, bool>>& urls,
+    static QNetworkReply::NetworkError downloadIcon(const QList<IconLocation>& urls,
                                                     int timeout,
                                                     QPixmap& output,
                                                     const QList<QPair<QByteArray, QByteArray>>& additional_headers,
diff --git a/src/librssguard/services/greader/greadernetwork.cpp b/src/librssguard/services/greader/greadernetwork.cpp
index 8c79194de..0d6e385a0 100644
--- a/src/librssguard/services/greader/greadernetwork.cpp
+++ b/src/librssguard/services/greader/greadernetwork.cpp
@@ -703,7 +703,7 @@ RootItem* GreaderNetwork::decodeTagsSubscriptions(const QString& categories,
 
     if (obtain_icons) {
       QString icon_url = subscription[QSL("iconUrl")].toString();
-      QList<QPair<QString, bool>> icon_urls;
+      QList<IconLocation> icon_urls;
 
       if (!icon_url.isEmpty()) {
         if (icon_url.startsWith(QSL("//"))) {
diff --git a/src/librssguard/services/standard/gui/standardfeeddetails.cpp b/src/librssguard/services/standard/gui/standardfeeddetails.cpp
index 2d196eec2..5224bd79c 100644
--- a/src/librssguard/services/standard/gui/standardfeeddetails.cpp
+++ b/src/librssguard/services/standard/gui/standardfeeddetails.cpp
@@ -52,6 +52,10 @@ StandardFeedDetails::StandardFeedDetails(QWidget* parent) : QWidget(parent) {
                           QVariant::fromValue(int(StandardFeed::Type::Rss2X)));
   m_ui.m_cmbType->addItem(StandardFeed::typeToString(StandardFeed::Type::Json),
                           QVariant::fromValue(int(StandardFeed::Type::Json)));
+  m_ui.m_cmbType->addItem(StandardFeed::typeToString(StandardFeed::Type::Sitemap),
+                          QVariant::fromValue(int(StandardFeed::Type::Sitemap)));
+  m_ui.m_cmbType->addItem(StandardFeed::typeToString(StandardFeed::Type::SitemapIndex),
+                          QVariant::fromValue(int(StandardFeed::Type::SitemapIndex)));
 
   // Load available encodings.
   const QList<QByteArray> encodings = QTextCodec::availableCodecs();
diff --git a/src/librssguard/services/standard/parsers/atomparser.cpp b/src/librssguard/services/standard/parsers/atomparser.cpp
index 13d87e635..e849c5f7d 100644
--- a/src/librssguard/services/standard/parsers/atomparser.cpp
+++ b/src/librssguard/services/standard/parsers/atomparser.cpp
@@ -2,7 +2,13 @@
 
 #include "services/standard/parsers/atomparser.h"
 
+#include "definitions/definitions.h"
+#include "exceptions/applicationexception.h"
 #include "miscellaneous/textfactory.h"
+#include "services/standard/definitions.h"
+#include "services/standard/standardfeed.h"
+
+#include <QTextCodec>
 
 AtomParser::AtomParser(const QString& data) : FeedParser(data) {
   QString version = m_xml.documentElement().attribute(QSL("version"));
@@ -15,6 +21,70 @@ AtomParser::AtomParser(const QString& data) : FeedParser(data) {
   }
 }
 
+AtomParser::~AtomParser() {}
+
+QPair<StandardFeed*, QList<IconLocation>> AtomParser::guessFeed(const QByteArray& content,
+                                                                const QString& content_type) const {
+  QString xml_schema_encoding = QSL(DEFAULT_FEED_ENCODING);
+  QString xml_contents_encoded;
+  QString enc =
+    QRegularExpression(QSL("encoding=\"([A-Z0-9\\-]+)\""), QRegularExpression::PatternOption::CaseInsensitiveOption)
+      .match(content)
+      .captured(1);
+
+  if (!enc.isEmpty()) {
+    // Some "encoding" attribute was found get the encoding
+    // out of it.
+    xml_schema_encoding = enc;
+  }
+
+  QTextCodec* custom_codec = QTextCodec::codecForName(xml_schema_encoding.toLocal8Bit());
+
+  if (custom_codec != nullptr) {
+    xml_contents_encoded = custom_codec->toUnicode(content);
+  }
+  else {
+    xml_contents_encoded = QString::fromUtf8(content);
+  }
+
+  // Feed XML was obtained, guess it now.
+  QDomDocument xml_document;
+  QString error_msg;
+  int error_line, error_column;
+
+  if (!xml_document.setContent(xml_contents_encoded, true, &error_msg, &error_line, &error_column)) {
+    throw ApplicationException(QObject::tr("XML is not well-formed, %1").arg(error_msg));
+  }
+
+  QDomElement root_element = xml_document.documentElement();
+
+  if (root_element.namespaceURI() != atomNamespace()) {
+    throw ApplicationException(QObject::tr("not an ATOM feed"));
+  }
+
+  auto* feed = new StandardFeed();
+  QList<IconLocation> icon_possible_locations;
+
+  feed->setEncoding(xml_schema_encoding);
+  feed->setType(StandardFeed::Type::Atom10);
+  feed->setTitle(root_element.namedItem(QSL("title")).toElement().text());
+  feed->setDescription(root_element.namedItem(QSL("subtitle")).toElement().text());
+
+  QString icon_link = root_element.namedItem(QSL("icon")).toElement().text();
+
+  if (!icon_link.isEmpty()) {
+    icon_possible_locations.append({icon_link, true});
+  }
+
+  QString home_page = root_element.namedItem(QSL("link")).toElement().attribute(QSL("href"));
+
+  if (!home_page.isEmpty()) {
+    icon_possible_locations.prepend({home_page, false});
+  }
+
+  return {feed, icon_possible_locations};
+}
+
 QString AtomParser::feedAuthor() const {
   auto authors = m_xml.documentElement().elementsByTagNameNS(m_atomNamespace, QSL("author"));
 
diff --git a/src/librssguard/services/standard/parsers/atomparser.h b/src/librssguard/services/standard/parsers/atomparser.h
index 2e6d6f83e..94f71668f 100644
--- a/src/librssguard/services/standard/parsers/atomparser.h
+++ b/src/librssguard/services/standard/parsers/atomparser.h
@@ -13,8 +13,10 @@
 class AtomParser : public FeedParser {
   public:
     explicit AtomParser(const QString& data);
+    virtual ~AtomParser();
 
-    QString atomNamespace() const;
+    virtual QPair<StandardFeed*, QList<IconLocation>> guessFeed(const QByteArray& content,
+                                                                const QString& content_type) const;
 
   protected:
     virtual QString xmlMessageTitle(const QDomElement& msg_element) const;
@@ -29,6 +31,8 @@ class AtomParser : public FeedParser {
     virtual QString feedAuthor() const;
 
   private:
+    QString atomNamespace() const;
+
     QString m_atomNamespace;
 };
 
diff --git a/src/librssguard/services/standard/parsers/feedparser.cpp b/src/librssguard/services/standard/parsers/feedparser.cpp
index cdfd2f3a0..e113877fb 100644
--- a/src/librssguard/services/standard/parsers/feedparser.cpp
+++ b/src/librssguard/services/standard/parsers/feedparser.cpp
@@ -15,6 +15,9 @@
 
 FeedParser::FeedParser(QString data, bool is_xml)
   : m_isXml(is_xml), m_data(std::move(data)), m_mrssNamespace(QSL("http://search.yahoo.com/mrss/")) {
+  if (m_data.isEmpty()) {
+    return;
+  }
 
   if (m_isXml) {
     // XML.
@@ -36,6 +39,8 @@ FeedParser::FeedParser(QString data, bool is_xml)
   }
 }
 
+FeedParser::~FeedParser() {}
+
 QString FeedParser::xmlMessageRawContents(const QDomElement& msg_element) const {
   QString raw_contents;
   QTextStream str(&raw_contents);
diff --git a/src/librssguard/services/standard/parsers/feedparser.h b/src/librssguard/services/standard/parsers/feedparser.h
index 51ea277c3..04bfa34e8 100644
--- a/src/librssguard/services/standard/parsers/feedparser.h
+++ b/src/librssguard/services/standard/parsers/feedparser.h
@@ -10,12 +10,18 @@
 #include <QString>
 
 #include "core/message.h"
+#include "definitions/typedefs.h"
+
+class StandardFeed;
 
 // Base class for all XML-based feed parsers.
 class FeedParser {
   public:
     explicit FeedParser(QString data, bool is_xml = true);
+    virtual ~FeedParser();
 
+    virtual QPair<StandardFeed*, QList<IconLocation>> guessFeed(const QByteArray& content,
+                                                                const QString& content_type) const = 0;
     virtual QList<Message> messages();
 
   protected:
diff --git a/src/librssguard/services/standard/parsers/jsonparser.cpp b/src/librssguard/services/standard/parsers/jsonparser.cpp
index ace33f3a0..b87e6bf8d 100644
--- a/src/librssguard/services/standard/parsers/jsonparser.cpp
+++ b/src/librssguard/services/standard/parsers/jsonparser.cpp
@@ -2,7 +2,13 @@
 
 #include "services/standard/parsers/jsonparser.h"
 
+#include "definitions/definitions.h"
+#include "definitions/typedefs.h"
+#include "exceptions/applicationexception.h"
+#include "exceptions/feedrecognizedbutfailedexception.h"
 #include "miscellaneous/textfactory.h"
+#include "services/standard/definitions.h"
+#include "services/standard/standardfeed.h"
 
 #include <QJsonArray>
 #include <QJsonDocument>
@@ -10,6 +16,51 @@
 
 JsonParser::JsonParser(const QString& data) : FeedParser(data, false) {}
 
+JsonParser::~JsonParser() {}
+
+QPair<StandardFeed*, QList<IconLocation>> JsonParser::guessFeed(const QByteArray& content,
+                                                                const QString& content_type) const {
+  if (content_type.contains(QSL("json"), Qt::CaseSensitivity::CaseInsensitive) ||
+      content.simplified().startsWith('{')) {
+    QJsonParseError json_err;
+    QJsonDocument json = QJsonDocument::fromJson(content, &json_err);
+
+    if (json.isNull() && !json_err.errorString().isEmpty()) {
+      throw FeedRecognizedButFailedException(QObject::tr("JSON error '%1'").arg(json_err.errorString()));
+    }
+
+    auto* feed = new StandardFeed();
+    QList<IconLocation> icon_possible_locations;
+
+    feed->setEncoding(QSL(DEFAULT_FEED_ENCODING));
+    feed->setType(StandardFeed::Type::Json);
+    feed->setTitle(json.object()[QSL("title")].toString());
+    feed->setDescription(json.object()[QSL("description")].toString());
+
+    auto home_page = json.object()[QSL("home_page_url")].toString();
+
+    if (!home_page.isEmpty()) {
+      icon_possible_locations.prepend({home_page, false});
+    }
+
+    auto icon = json.object()[QSL("favicon")].toString();
+
+    if (icon.isEmpty()) {
+      icon = json.object()[QSL("icon")].toString();
+    }
+
+    if (!icon.isEmpty()) {
+      // Low priority, download directly.
+      icon_possible_locations.append({icon, true});
+    }
+
+    return QPair<StandardFeed*, QList<IconLocation>>(feed, icon_possible_locations);
+  }
+  else {
+    throw ApplicationException(QObject::tr("not a JSON feed"));
+  }
+}
+
 QString JsonParser::feedAuthor() const {
   QString global_author = m_json.object()[QSL("author")].toObject()[QSL("name")].toString();
 
diff --git a/src/librssguard/services/standard/parsers/jsonparser.h b/src/librssguard/services/standard/parsers/jsonparser.h
index 42b6dd921..9ec826e3d 100644
--- a/src/librssguard/services/standard/parsers/jsonparser.h
+++ b/src/librssguard/services/standard/parsers/jsonparser.h
@@ -10,6 +10,10 @@
 class JsonParser : public FeedParser {
   public:
     explicit JsonParser(const QString& data);
+    virtual ~JsonParser();
+
+    virtual QPair<StandardFeed*, QList<IconLocation>> guessFeed(const QByteArray& content,
+                                                                const QString& content_type) const;
 
   protected:
     virtual QString feedAuthor() const;
diff --git a/src/librssguard/services/standard/parsers/rdfparser.cpp b/src/librssguard/services/standard/parsers/rdfparser.cpp
index 1a478b584..6f97037e1 100644
--- a/src/librssguard/services/standard/parsers/rdfparser.cpp
+++ b/src/librssguard/services/standard/parsers/rdfparser.cpp
@@ -2,15 +2,81 @@
 
 #include "services/standard/parsers/rdfparser.h"
 
+#include "exceptions/applicationexception.h"
 #include "miscellaneous/textfactory.h"
+#include "services/standard/definitions.h"
+#include "services/standard/standardfeed.h"
 
 #include <QDomDocument>
+#include <QTextCodec>
 
 RdfParser::RdfParser(const QString& data)
   : FeedParser(data), m_rdfNamespace(QSL("http://www.w3.org/1999/02/22-rdf-syntax-ns#")),
     m_rssNamespace(QSL("http://purl.org/rss/1.0/")), m_rssCoNamespace(QSL("http://purl.org/rss/1.0/modules/content/")),
     m_dcElNamespace(QSL("http://purl.org/dc/elements/1.1/")) {}
 
+RdfParser::~RdfParser() {}
+
+QPair<StandardFeed*, QList<IconLocation>> RdfParser::guessFeed(const QByteArray& content,
+                                                               const QString& content_type) const {
+  QString xml_schema_encoding = QSL(DEFAULT_FEED_ENCODING);
+  QString xml_contents_encoded;
+  QString enc =
+    QRegularExpression(QSL("encoding=\"([A-Z0-9\\-]+)\""), QRegularExpression::PatternOption::CaseInsensitiveOption)
+      .match(content)
+      .captured(1);
+
+  if (!enc.isEmpty()) {
+    // Some "encoding" attribute was found get the encoding
+    // out of it.
+    xml_schema_encoding = enc;
+  }
+
+  QTextCodec* custom_codec = QTextCodec::codecForName(xml_schema_encoding.toLocal8Bit());
+
+  if (custom_codec != nullptr) {
+    xml_contents_encoded = custom_codec->toUnicode(content);
+  }
+  else {
+    xml_contents_encoded = QString::fromUtf8(content);
+  }
+
+  // Feed XML was obtained, guess it now.
+  QDomDocument xml_document;
+  QString error_msg;
+  int error_line, error_column;
+
+  if (!xml_document.setContent(xml_contents_encoded, true, &error_msg, &error_line, &error_column)) {
+    throw ApplicationException(QObject::tr("XML is not well-formed, %1").arg(error_msg));
+  }
+
+  QDomElement root_element = xml_document.documentElement();
+
+  if (root_element.namespaceURI() != rdfNamespace()) {
+    throw ApplicationException(QObject::tr("not an RDF feed"));
+  }
+
+  auto* feed = new StandardFeed();
+  QList<IconLocation> icon_possible_locations;
+
+  feed->setEncoding(xml_schema_encoding);
+  feed->setType(StandardFeed::Type::Rdf);
+
+  QDomElement channel_element = root_element.elementsByTagNameNS(rssNamespace(), QSL("channel")).at(0).toElement();
+
+  feed->setTitle(channel_element.elementsByTagNameNS(rssNamespace(), QSL("title")).at(0).toElement().text());
+  feed
+    ->setDescription(channel_element.elementsByTagNameNS(rssNamespace(), QSL("description")).at(0).toElement().text());
+
+  QString home_page = channel_element.elementsByTagNameNS(rssNamespace(), QSL("link")).at(0).toElement().text();
+
+  if (!home_page.isEmpty()) {
+    icon_possible_locations.prepend({home_page, false});
+  }
+
+  return {feed, icon_possible_locations};
+}
+
 QDomNodeList RdfParser::xmlMessageElements() {
   return m_xml.elementsByTagNameNS(m_rssNamespace, QSL("item"));
 }
diff --git a/src/librssguard/services/standard/parsers/rdfparser.h b/src/librssguard/services/standard/parsers/rdfparser.h
index 3b67d7ad9..dbdb23aae 100644
--- a/src/librssguard/services/standard/parsers/rdfparser.h
+++ b/src/librssguard/services/standard/parsers/rdfparser.h
@@ -12,9 +12,10 @@
 class RdfParser : public FeedParser {
   public:
     explicit RdfParser(const QString& data);
+    virtual ~RdfParser();
 
-    QString rdfNamespace() const;
-    QString rssNamespace() const;
+    virtual QPair<StandardFeed*, QList<IconLocation>> guessFeed(const QByteArray& content,
+                                                                const QString& content_type) const;
 
   protected:
     virtual QString xmlMessageTitle(const QDomElement& msg_element) const;
@@ -27,6 +28,9 @@ class RdfParser : public FeedParser {
     virtual QDomNodeList xmlMessageElements();
 
   private:
+    QString rdfNamespace() const;
+    QString rssNamespace() const;
+
     QString m_rdfNamespace;
     QString m_rssNamespace;
     QString m_rssCoNamespace;
diff --git a/src/librssguard/services/standard/parsers/rssparser.cpp b/src/librssguard/services/standard/parsers/rssparser.cpp
index ab15d15e0..5d2590388 100644
--- a/src/librssguard/services/standard/parsers/rssparser.cpp
+++ b/src/librssguard/services/standard/parsers/rssparser.cpp
@@ -2,13 +2,97 @@
 
 #include "services/standard/parsers/rssparser.h"
 
+#include "exceptions/applicationexception.h"
 #include "miscellaneous/textfactory.h"
+#include "services/standard/definitions.h"
+#include "services/standard/standardfeed.h"
 
 #include <QDomDocument>
+#include <QTextCodec>
 #include <QTextStream>
 
 RssParser::RssParser(const QString& data) : FeedParser(data) {}
 
+RssParser::~RssParser() {}
+
+QPair<StandardFeed*, QList<IconLocation>> RssParser::guessFeed(const QByteArray& content,
+                                                               const QString& content_type) const {
+  QString xml_schema_encoding = QSL(DEFAULT_FEED_ENCODING);
+  QString xml_contents_encoded;
+  QString enc =
+    QRegularExpression(QSL("encoding=\"([A-Z0-9\\-]+)\""), QRegularExpression::PatternOption::CaseInsensitiveOption)
+      .match(content)
+      .captured(1);
+
+  if (!enc.isEmpty()) {
+    // Some "encoding" attribute was found get the encoding
+    // out of it.
+    xml_schema_encoding = enc;
+  }
+
+  QTextCodec* custom_codec = QTextCodec::codecForName(xml_schema_encoding.toLocal8Bit());
+
+  if (custom_codec != nullptr) {
+    xml_contents_encoded = custom_codec->toUnicode(content);
+  }
+  else {
+    xml_contents_encoded = QString::fromUtf8(content);
+  }
+
+  // Feed XML was obtained, guess it now.
+  QDomDocument xml_document;
+  QString error_msg;
+  int error_line, error_column;
+
+  if (!xml_document.setContent(xml_contents_encoded, true, &error_msg, &error_line, &error_column)) {
+    throw ApplicationException(QObject::tr("XML is not well-formed, %1").arg(error_msg));
+  }
+
+  QDomElement root_element = xml_document.documentElement();
+
+  if (root_element.tagName() != QL1S("rss")) {
+    throw ApplicationException(QObject::tr("not a RSS feed"));
+  }
+
+  auto* feed = new StandardFeed();
+  QList<IconLocation> icon_possible_locations;
+
+  feed->setEncoding(xml_schema_encoding);
+
+  QString rss_type = root_element.attribute(QSL("version"), QSL("2.0"));
+
+  if (rss_type == QL1S("0.91") || rss_type == QL1S("0.92") || rss_type == QL1S("0.93")) {
+    feed->setType(StandardFeed::Type::Rss0X);
+  }
+  else {
+    feed->setType(StandardFeed::Type::Rss2X);
+  }
+
+  QDomElement channel_element = root_element.namedItem(QSL("channel")).toElement();
+
+  feed->setTitle(channel_element.namedItem(QSL("title")).toElement().text());
+  feed->setDescription(channel_element.namedItem(QSL("description")).toElement().text());
+
+  QString icon_url_link = channel_element.namedItem(QSL("image")).namedItem(QSL("url")).toElement().text();
+
+  if (!icon_url_link.isEmpty()) {
+    icon_possible_locations.append({icon_url_link, true});
+  }
+
+  auto channel_links = channel_element.elementsByTagName(QSL("link"));
+
+  for (int i = 0; i < channel_links.size(); i++) {
+    QString home_page = channel_links.at(i).toElement().text();
+
+    if (!home_page.isEmpty()) {
+      icon_possible_locations.prepend({home_page, false});
+      break;
+    }
+  }
+
+  return {feed, icon_possible_locations};
+}
+
 QDomNodeList RssParser::xmlMessageElements() {
   QDomNode channel_elem = m_xml.namedItem(QSL("rss")).namedItem(QSL("channel"));
 
diff --git a/src/librssguard/services/standard/parsers/rssparser.h b/src/librssguard/services/standard/parsers/rssparser.h
index 3475fd521..f8abfb0b0 100644
--- a/src/librssguard/services/standard/parsers/rssparser.h
+++ b/src/librssguard/services/standard/parsers/rssparser.h
@@ -12,6 +12,10 @@
 class RssParser : public FeedParser {
   public:
     explicit RssParser(const QString& data);
+    virtual ~RssParser();
+
+    virtual QPair<StandardFeed*, QList<IconLocation>> guessFeed(const QByteArray& content,
+                                                                const QString& content_type) const;
 
   protected:
     virtual QDomNodeList xmlMessageElements();
diff --git a/src/librssguard/services/standard/parsers/sitemapparser.cpp b/src/librssguard/services/standard/parsers/sitemapparser.cpp
new file mode 100644
index 000000000..52c5bc101
--- /dev/null
+++ b/src/librssguard/services/standard/parsers/sitemapparser.cpp
@@ -0,0 +1,154 @@
+// For license of this file, see <project-root-folder>/LICENSE.md.
+
+#include "services/standard/parsers/sitemapparser.h"
+
+#if defined(ENABLE_COMPRESSED_SITEMAP)
+#include "3rd-party/qcompressor/qcompressor.h"
+#endif
+
+#include "definitions/definitions.h"
+#include "exceptions/applicationexception.h"
+#include "exceptions/feedrecognizedbutfailedexception.h"
+#include "services/standard/definitions.h"
+#include "services/standard/standardfeed.h"
+
+#include <QDomDocument>
+#include <QTextCodec>
+#include <QTextStream>
+
+SitemapParser::SitemapParser(const QString& data) : FeedParser(data) {}
+
+SitemapParser::~SitemapParser() {}
+
+QPair<StandardFeed*, QList<IconLocation>> SitemapParser::guessFeed(const QByteArray& content,
+                                                                   const QString& content_type) const {
+  QByteArray uncompressed_content;
+
+  if (isGzip(content)) {
+#if defined(ENABLE_COMPRESSED_SITEMAP)
+    QCompressor::gzipDecompress(content, uncompressed_content);
+#else
+    throw FeedRecognizedButFailedException(QObject::tr("support for gzipped sitemaps is not enabled"));
+#endif
+  }
+  else {
+    uncompressed_content = content;
+  }
+
+  QString xml_schema_encoding = QSL(DEFAULT_FEED_ENCODING);
+  QString xml_contents_encoded;
+  QString enc =
+    QRegularExpression(QSL("encoding=\"([A-Z0-9\\-]+)\""), QRegularExpression::PatternOption::CaseInsensitiveOption)
+      .match(uncompressed_content)
+      .captured(1);
+
+  if (!enc.isEmpty()) {
+    // Some "encoding" attribute was found get the encoding
+    // out of it.
+    xml_schema_encoding = enc;
+  }
+
+  QTextCodec* custom_codec = QTextCodec::codecForName(xml_schema_encoding.toLocal8Bit());
+
+  if (custom_codec != nullptr) {
+    xml_contents_encoded = custom_codec->toUnicode(uncompressed_content);
+  }
+  else {
+    xml_contents_encoded = QString::fromUtf8(uncompressed_content);
+  }
+
+  // Feed XML was obtained, guess it now.
+  QDomDocument xml_document;
+  QString error_msg;
+  int error_line, error_column;
+
+  if (!xml_document.setContent(xml_contents_encoded, true, &error_msg, &error_line, &error_column)) {
+    throw ApplicationException(QObject::tr("XML is not well-formed, %1").arg(error_msg));
+  }
+
+  QDomElement root_element = xml_document.documentElement();
+
+  if (root_element.tagName() != QSL("urlset") && root_element.tagName() != QSL("sitemapindex")) {
+    throw ApplicationException(QObject::tr("not a Sitemap"));
+  }
+
+  auto* feed = new StandardFeed();
+  QList<IconLocation> icon_possible_locations;
+
+  feed->setEncoding(xml_schema_encoding);
+
+  if (root_element.tagName() == QSL("urlset")) {
+    // Sitemap.
+    feed->setType(StandardFeed::Type::Sitemap);
+    feed->setTitle(StandardFeed::typeToString(StandardFeed::Type::Sitemap));
+  }
+  else {
+    // Sitemap index.
+    feed->setType(StandardFeed::Type::SitemapIndex);
+    feed->setTitle(StandardFeed::typeToString(StandardFeed::Type::SitemapIndex));
+  }
+
+  return {feed, icon_possible_locations};
+}
+
+QString SitemapParser::sitemapNamespace() const {
+  return QSL("http://www.sitemaps.org/schemas/sitemap/0.9");
+}
+
+QString SitemapParser::sitemapNewsNamespace() const {
+  return QSL("http://www.google.com/schemas/sitemap-news/0.9");
+}
+
+QString SitemapParser::sitemapImageNamespace() const {
+  return QSL("http://www.google.com/schemas/sitemap-image/1.1");
+}
+
+QString SitemapParser::sitemapVideoNamespace() const {
+  return QSL("http://www.google.com/schemas/sitemap-video/1.1");
+}
+
+QDomNodeList SitemapParser::xmlMessageElements() {
+  return {};
+}
+
+// TODO: implement
+
+QString SitemapParser::xmlMessageTitle(const QDomElement& msg_element) const {
+  return {};
+}
+
+QString SitemapParser::xmlMessageUrl(const QDomElement& msg_element) const {
+  return {};
+}
+
+QString SitemapParser::xmlMessageDescription(const QDomElement& msg_element) const {
+  return {};
+}
+
+QString SitemapParser::xmlMessageAuthor(const QDomElement& msg_element) const {
+  return {};
+}
+
+QDateTime SitemapParser::xmlMessageDateCreated(const QDomElement& msg_element) const {
+  return {};
+}
+
+QString SitemapParser::xmlMessageId(const QDomElement& msg_element) const {
+  return {};
+}
+
+QList<Enclosure> SitemapParser::xmlMessageEnclosures(const QDomElement& msg_element) const {
+  return {};
+}
+
+QList<MessageCategory> SitemapParser::xmlMessageCategories(const QDomElement& msg_element) const {
+  return {};
+}
+
+QString SitemapParser::xmlMessageRawContents(const QDomElement& msg_element) const {
+  return {};
+}
+
+bool SitemapParser::isGzip(const QByteArray& content) {
+  return ((content[0] & 0xFF) == 0x1f) && ((content[1] & 0xFF) == 0x8b);
+}
diff --git a/src/librssguard/services/standard/parsers/sitemapparser.h b/src/librssguard/services/standard/parsers/sitemapparser.h
new file mode 100644
index 000000000..7279ab951
--- /dev/null
+++ b/src/librssguard/services/standard/parsers/sitemapparser.h
@@ -0,0 +1,37 @@
+// For license of this file, see <project-root-folder>/LICENSE.md.
+
+#ifndef SITEMAPPARSER_H
+#define SITEMAPPARSER_H
+
+#include "services/standard/parsers/feedparser.h"
+
+class SitemapParser : public FeedParser {
+  public:
+    explicit SitemapParser(const QString& data);
+    virtual ~SitemapParser();
+
+    virtual QPair<StandardFeed*, QList<IconLocation>> guessFeed(const QByteArray& content,
+                                                                const QString& content_type) const;
+
+    static bool isGzip(const QByteArray& content);
+
+  protected:
+    virtual QDomNodeList xmlMessageElements();
+    virtual QString xmlMessageTitle(const QDomElement& msg_element) const;
+    virtual QString xmlMessageUrl(const QDomElement& msg_element) const;
+    virtual QString xmlMessageDescription(const QDomElement& msg_element) const;
+    virtual QString xmlMessageAuthor(const QDomElement& msg_element) const;
+    virtual QDateTime xmlMessageDateCreated(const QDomElement& msg_element) const;
+    virtual QString xmlMessageId(const QDomElement& msg_element) const;
+    virtual QList<Enclosure> xmlMessageEnclosures(const QDomElement& msg_element) const;
+    virtual QList<MessageCategory> xmlMessageCategories(const QDomElement& msg_element) const;
+    virtual QString xmlMessageRawContents(const QDomElement& msg_element) const;
+
+  private:
+    QString sitemapNamespace() const;
+    QString sitemapNewsNamespace() const;
+    QString sitemapImageNamespace() const;
+    QString sitemapVideoNamespace() const;
+};
+
+#endif // SITEMAPPARSER_H
diff --git a/src/librssguard/services/standard/standardfeed.cpp b/src/librssguard/services/standard/standardfeed.cpp
index db0787c63..894edda22 100644
--- a/src/librssguard/services/standard/standardfeed.cpp
+++ b/src/librssguard/services/standard/standardfeed.cpp
@@ -5,16 +5,20 @@
 #include "database/databasequeries.h"
 #include "definitions/definitions.h"
 #include "exceptions/applicationexception.h"
+#include "exceptions/feedrecognizedbutfailedexception.h"
 #include "exceptions/networkexception.h"
 #include "exceptions/scriptexception.h"
 #include "miscellaneous/settings.h"
 #include "miscellaneous/textfactory.h"
-#include "services/standard/definitions.h"
 #include "services/standard/gui/formstandardfeeddetails.h"
-#include "services/standard/parsers/atomparser.h"
-#include "services/standard/parsers/rdfparser.h"
 #include "services/standard/standardserviceroot.h"
 
+#include "services/standard/parsers/atomparser.h"
+#include "services/standard/parsers/jsonparser.h"
+#include "services/standard/parsers/rdfparser.h"
+#include "services/standard/parsers/rssparser.h"
+#include "services/standard/parsers/sitemapparser.h"
+
 #include <QCommandLineParser>
 #include <QDomDocument>
 #include <QDomElement>
@@ -24,6 +28,7 @@
 #include <QPointer>
 #include <QProcess>
 #include <QProcessEnvironment>
+#include <QScopedPointer>
 #include <QTextCodec>
 #include <QVariant>
 #include <QXmlStreamReader>
@@ -151,6 +156,12 @@ QString StandardFeed::typeToString(StandardFeed::Type type) {
     case Type::Json:
       return QSL("JSON 1.0/1.1");
 
+    case Type::Sitemap:
+      return QSL("Sitemap");
+
+    case Type::SitemapIndex:
+      return QSL("Sitemap Index");
+
     case Type::Rss2X:
     default:
       return QSL("RSS 2.0/2.0.1");
@@ -270,172 +281,36 @@ StandardFeed* StandardFeed::guessFeed(StandardFeed::SourceType source_type,
   }
 
   StandardFeed* feed = nullptr;
+  QList<IconLocation> icon_possible_locations;
+  QList<QSharedPointer<FeedParser>> parsers;
 
-  // Now we need to obtain list of URLs of icons.
-  // Priority of links:
-  //   1. Links of "homepage" obtained from feed files which will be processed via DuckDuckGo.
-  //   2. Direct links of "favicon", "icon", "logo" obtained from feed files which will be downloaded directly.
-  //   3. Link of the feed file itself which will be processed via DuckDuckGo.
-  // The "bool" if true means that the URL is direct and download directly, if false then
-  // only use its domain and download via DuckDuckGo.
-  QList<QPair<QString, bool>> icon_possible_locations;
+  parsers.append(QSharedPointer<FeedParser>(new AtomParser({})));
+  parsers.append(QSharedPointer<FeedParser>(new RssParser({})));
+  parsers.append(QSharedPointer<FeedParser>(new RdfParser({})));
+  parsers.append(QSharedPointer<FeedParser>(new JsonParser({})));
+  parsers.append(QSharedPointer<FeedParser>(new SitemapParser({})));
 
-  if (content_type.contains(QSL("json"), Qt::CaseSensitivity::CaseInsensitive) || feed_contents.startsWith('{')) {
-    feed = new StandardFeed();
+  for (const QSharedPointer<FeedParser>& parser : parsers) {
+    try {
+      QPair<StandardFeed*, QList<IconLocation>> res = parser->guessFeed(feed_contents, content_type);
 
-    // We have JSON feed.
-    feed->setEncoding(QSL(DEFAULT_FEED_ENCODING));
-    feed->setType(Type::Json);
-
-    QJsonParseError json_err;
-    QJsonDocument json = QJsonDocument::fromJson(feed_contents, &json_err);
-
-    if (json.isNull() && !json_err.errorString().isEmpty()) {
-      throw ApplicationException(tr("JSON error '%1'").arg(json_err.errorString()));
+      feed = res.first;
+      icon_possible_locations = res.second;
+      break;
     }
-
-    feed->setTitle(json.object()[QSL("title")].toString());
-    feed->setDescription(json.object()[QSL("description")].toString());
-
-    auto home_page = json.object()[QSL("home_page_url")].toString();
-
-    if (!home_page.isEmpty()) {
-      icon_possible_locations.prepend({home_page, false});
+    catch (const FeedRecognizedButFailedException& format_ex) {
+      // Parser reports that it is right parser for this feed
+      // but its support is not enabled or available or it is broken.
+      // In this case abort.
+      throw format_ex;
     }
-
-    auto icon = json.object()[QSL("favicon")].toString();
-
-    if (icon.isEmpty()) {
-      icon = json.object()[QSL("icon")].toString();
-    }
-
-    if (!icon.isEmpty()) {
-      // Low priority, download directly.
-      icon_possible_locations.append({icon, true});
+    catch (const ApplicationException& ex) {
+      qWarningNN << LOGSEC_CORE << "Feed guessing error:" << QUOTE_W_SPACE_DOT(ex.message());
     }
   }
-  else {
-    // Feed XML was obtained, now we need to try to guess
-    // its encoding before we can read further data.
-    QString xml_schema_encoding;
-    QString xml_contents_encoded;
-    QString enc =
-      QRegularExpression(QSL("encoding=\"([A-Z0-9\\-]+)\""), QRegularExpression::PatternOption::CaseInsensitiveOption)
-        .match(feed_contents)
-        .captured(1);
 
-    if (!enc.isEmpty()) {
-      // Some "encoding" attribute was found get the encoding
-      // out of it.
-      xml_schema_encoding = enc;
-    }
-
-    QTextCodec* custom_codec = QTextCodec::codecForName(xml_schema_encoding.toLocal8Bit());
-    QString encod;
-
-    if (custom_codec != nullptr) {
-      // Feed encoding was probably guessed.
-      xml_contents_encoded = custom_codec->toUnicode(feed_contents);
-      encod = xml_schema_encoding;
-    }
-    else {
-      // Feed encoding probably not guessed, set it as
-      // default.
-      xml_contents_encoded = feed_contents;
-      encod = QSL(DEFAULT_FEED_ENCODING);
-    }
-
-    // Feed XML was obtained, guess it now.
-    QDomDocument xml_document;
-    QString error_msg;
-    int error_line, error_column;
-
-    if (!xml_document.setContent(xml_contents_encoded, true, &error_msg, &error_line, &error_column)) {
-      throw ApplicationException(tr("XML is not well-formed, %1").arg(error_msg));
-    }
-
-    feed = new StandardFeed();
-    feed->setEncoding(encod);
-
-    QDomElement root_element = xml_document.documentElement();
-    RdfParser rdf(QSL("<a/>"));
-    AtomParser atom(QSL("<a/>"));
-
-    if (root_element.namespaceURI() == rdf.rdfNamespace()) {
-      // We found RDF feed.
-      QDomElement channel_element =
-        root_element.elementsByTagNameNS(rdf.rssNamespace(), QSL("channel")).at(0).toElement();
-
-      feed->setType(Type::Rdf);
-      feed->setTitle(channel_element.elementsByTagNameNS(rdf.rssNamespace(), QSL("title")).at(0).toElement().text());
-      feed->setDescription(channel_element.elementsByTagNameNS(rdf.rssNamespace(), QSL("description"))
-                             .at(0)
-                             .toElement()
-                             .text());
-
-      QString home_page = channel_element.elementsByTagNameNS(rdf.rssNamespace(), QSL("link")).at(0).toElement().text();
-
-      if (!home_page.isEmpty()) {
-        icon_possible_locations.prepend({home_page, false});
-      }
-    }
-    else if (root_element.tagName() == QL1S("rss")) {
-      // We found RSS 0.91/0.92/0.93/2.0/2.0.1 feed.
-      QString rss_type = root_element.attribute(QSL("version"), QSL("2.0"));
-
-      if (rss_type == QL1S("0.91") || rss_type == QL1S("0.92") || rss_type == QL1S("0.93")) {
-        feed->setType(Type::Rss0X);
-      }
-      else {
-        feed->setType(Type::Rss2X);
-      }
-
-      QDomElement channel_element = root_element.namedItem(QSL("channel")).toElement();
-
-      feed->setTitle(channel_element.namedItem(QSL("title")).toElement().text());
-      feed->setDescription(channel_element.namedItem(QSL("description")).toElement().text());
-
-      QString icon_url_link = channel_element.namedItem(QSL("image")).namedItem(QSL("url")).toElement().text();
-
-      if (!icon_url_link.isEmpty()) {
-        icon_possible_locations.append({icon_url_link, true});
-      }
-
-      auto channel_links = channel_element.elementsByTagName(QSL("link"));
-
-      for (int i = 0; i < channel_links.size(); i++) {
-        QString home_page = channel_links.at(i).toElement().text();
-
-        if (!home_page.isEmpty()) {
-          icon_possible_locations.prepend({home_page, false});
-          break;
-        }
-      }
-    }
-    else if (root_element.namespaceURI() == atom.atomNamespace()) {
-      // We found ATOM feed.
-      feed->setType(Type::Atom10);
-      feed->setTitle(root_element.namedItem(QSL("title")).toElement().text());
-      feed->setDescription(root_element.namedItem(QSL("subtitle")).toElement().text());
-
-      QString icon_link = root_element.namedItem(QSL("icon")).toElement().text();
-
-      if (!icon_link.isEmpty()) {
-        icon_possible_locations.append({icon_link, true});
-      }
-
-      QString home_page = root_element.namedItem(QSL("link")).toElement().attribute(QSL("href"));
-
-      if (!home_page.isEmpty()) {
-        icon_possible_locations.prepend({home_page, false});
-      }
-    }
-    else {
-      // File was downloaded and it really was XML file
-      // but feed format was NOT recognized.
-      feed->deleteLater();
-      throw ApplicationException(tr("XML feed file format unrecognized"));
-    }
+  if (feed == nullptr) {
+    throw ApplicationException(tr("feed format not recognized"));
   }
 
   if (source_type == SourceType::Url && icon_possible_locations.isEmpty()) {
@@ -474,7 +349,9 @@ bool StandardFeed::performDragDropChange(RootItem* target_item) {
 
     qApp->showGuiMessage(Notification::Event::GeneralEvent,
                          {tr("Cannot move feed"),
-                          tr("Cannot move feed, detailed information was logged via debug log."),
+                          tr("Cannot move feed, detailed "
+                             "information was logged via "
+                             "debug log."),
                           QSystemTrayIcon::MessageIcon::Critical});
     return false;
   }
@@ -550,7 +427,10 @@ QString StandardFeed::runScriptProcess(const QStringList& cmd_args,
 
     if (!raw_error.simplified().isEmpty()) {
       qWarningNN << LOGSEC_CORE
-                 << "Received error output from custom script even if it reported that it exited normally:"
+                 << "Received error output from "
+                    "custom script even if it "
+                    "reported that it exited "
+                    "normally:"
                  << QUOTE_W_SPACE_DOT(raw_error);
     }
 
diff --git a/src/librssguard/services/standard/standardfeed.h b/src/librssguard/services/standard/standardfeed.h
index a2c5754a4..e56cd6477 100644
--- a/src/librssguard/services/standard/standardfeed.h
+++ b/src/librssguard/services/standard/standardfeed.h
@@ -24,14 +24,20 @@ class StandardFeed : public Feed {
     friend class StandardCategory;
 
   public:
-    enum class SourceType { Url = 0, Script = 1, LocalFile = 2 };
+    enum class SourceType {
+      Url = 0,
+      Script = 1,
+      LocalFile = 2
+    };
 
     enum class Type {
       Rss0X = 0,
       Rss2X = 1,
       Rdf = 2, // Sometimes denoted as RSS 1.0.
       Atom10 = 3,
-      Json = 4
+      Json = 4,
+      SitemapIndex = 5,
+      Sitemap = 6
     };
 
     explicit StandardFeed(RootItem* parent_item = nullptr);
@@ -79,8 +85,8 @@ class StandardFeed : public Feed {
                                    const QString& post_process_script,
                                    NetworkFactory::NetworkAuthentication protection,
                                    bool fetch_icons = true,
-                                   const QString& username = QString(),
-                                   const QString& password = QString(),
+                                   const QString& username = {},
+                                   const QString& password = {},
                                    const QNetworkProxy& custom_proxy = QNetworkProxy::ProxyType::DefaultProxy);
 
     // Converts particular feed type to string.