diff --git a/SAX/helpers/FeatureNames.h b/SAX/helpers/FeatureNames.h
index e98ae2e2..13f5b974 100644
--- a/SAX/helpers/FeatureNames.h
+++ b/SAX/helpers/FeatureNames.h
@@ -15,22 +15,75 @@ struct FeatureNames
     typedef string_type stringT;
     typedef string_adaptor_type string_adaptorT;
 
-    const stringT namespaces;
-    const stringT namespace_prefixes;
-    const stringT validation;
+    /** Reports whether this parser processes external general entities; always
+     * true if validating.  */
     const stringT external_general;
+    /** Reports whether this parser processes external parameter entities; always
+     * true if validating.  */
     const stringT external_parameter;
+    /** May be examined only during a parse, after the startDocument() callback has
+     * been completed; read-only. The value is true if the document specified the
+     * "standalone" flag in its XML declaration, and otherwise is false.  */
+    const stringT is_standalone;
+    /** True indicates that the LexicalHandler will report the beginning and end
+     * of parameter entities.  */
+    const stringT lexical_parameter;
+    /** True indicates namespace URIs and unprefixed local names for element and
+     * attribute names will be available.*/
+    const stringT namespaces;
+    /** True indicates XML 1.0 names (with prefixes) and attributes (including
+     * xmlns* attributes) will be available. */
+    const stringT namespace_prefixes;
+    /**  A value of "true" indicates that system IDs in declarations will be
+     * absolutized (relative to their base URIs) before reporting. (That is the
+     * default behavior for all SAX2 XML parsers.) A value of "false" indicates
+     * those IDs will not be absolutized; parsers will provide the base URI from
+     * Locator.getSystemId(). This applies to system IDs passed in
+     *
+     * - DTDHandler.notationDecl(),
+     * - DTDHandler.unparsedEntityDecl(), and
+     * - DeclHandler.externalEntityDecl().
+     *
+     *It does not apply to EntityResolver.resolveEntity(), which is not used to
+     report declarations, or to LexicalHandler.startDTD(), which already provides
+     the non-absolutized URI. */
+    const stringT resolve_dtd_uris;
+    /** Returns true if the Attributes objects passed by this parser in
+     * ContentHandler.startElement()  implement the org.xml.sax.ext.Attributes2
+     * interface. That interface exposes additional DTD-related information, such
+     * as whether the attribute was specified in the source text rather than
+     * defaulted. */
     const stringT use_attributes2;
+    /**  Returns true if the Locator objects passed by this parser in
+     * ContentHandler.setDocumentLocator()  implement the org.xml.sax.ext.Locator2
+     * interface. That interface exposes additional entity information, such as
+     * the character encoding and XML version used. */
     const stringT use_locator2;
+    /**  Controls whether the parser is reporting all validity errors; if true,
+     * all external entities will be read. */
+    const stringT validation;
+    /**  Controls whether, when the namespace-prefixes feature is set, the parser
+     * treats namespace declaration attributes as being in the
+     * http://www.w3.org/2000/xmlns/ namespace. By default, SAX2 conforms to the
+     * original "Namespaces in XML" Recommendation, which explicitly states that
+     * such attributes are not in any namespace. Setting this optional flag to
+     * true makes the SAX2 events conform to a later backwards-incompatible
+     * revision of that recommendation, placing those attributes in a namespace.
+     * */
+    const stringT xmlns_uris;
 
     FeatureNames() :
-      namespaces(string_adaptorT().makeStringT("http://xml.org/sax/features/namespaces")),
-      namespace_prefixes(string_adaptorT().makeStringT("http://xml.org/sax/features/namespace-prefixes")),
-      validation(string_adaptorT().makeStringT("http://xml.org/sax/features/validation")),
       external_general(string_adaptorT().makeStringT("http://xml.org/sax/features/external-general-entities")),
       external_parameter(string_adaptorT().makeStringT("http://xml.org/sax/features/external-parameter-entities")),
+      is_standalone(string_adaptorT().makeStringT("http://xml.org/sax/features/is-standalone")),
+      lexical_parameter(string_adaptorT().makeStringT("http://xml.org/sax/features/lexical-handler/parameter-entities")),
+      namespaces(string_adaptorT().makeStringT("http://xml.org/sax/features/namespaces")),
+      namespace_prefixes(string_adaptorT().makeStringT("http://xml.org/sax/features/namespace-prefixes")),
+      resolve_dtd_uris(string_adaptorT().makeStringT("http://xml.org/sax/features/resolve-dtd-uris")),
       use_attributes2(string_adaptorT().makeStringT("http://xml.org/sax/features/use-attributes2")),
-      use_locator2(string_adaptorT().makeStringT("http://xml.org/sax/features/use-locator2"))
+      use_locator2(string_adaptorT().makeStringT("http://xml.org/sax/features/use-locator2")),
+      validation(string_adaptorT().makeStringT("http://xml.org/sax/features/validation")),
+      xmlns_uris(string_adaptorT().makeStringT("http://xml.org/sax/features/xmlns-uris"))
     {
     } // FeatureNames
 }; // class FeatureNames