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The System.Xml.Resolvers namespace defines the XmlPreloadedResolver and the XmlKnownDtds enumeration.

XmlPreloadedResolver is used as a resolver when automatic calls to the network are not desired or are not possible. For example, this type can be used for loading cached external DTDs. Another scenario is loading XHTML and using XmlPreloadedResolver to preload well-known DTDs that are defined in XHTML 1.0. Preloading a well-known DTD does not invoke any network connections because these DTDs are already embedded in the System.Xml.Utils assembly. Currently, XmlPreloadedResolver includes XHTML 1.0 and RSS 0.91 DTDs.

The XmlKnownDtds enumeration defines which well-known DTDs the XmlPreloadedResolver recognizes. The XmlKnownDtds enumeration contains the Xhtml10, Rss091, All, and None values.

XmlKnownDtd.Xhtml10 specifies that the T:System.Xml.Resolvers.XmlPreloadedResolver will recognize DTDs and entities that are defined in XHTML 1.0. For more information about XHTML, see the XHTML 1.0 specification.

XmlKnownDtd.Rss091 specifies that the T:System.Xml.Resolvers.XmlPreloadedResolver will recognize DTDs and entities that are defined in RSS 0.91.

XmlKnownDtd.All specifies that the XmlPreloadedResolver will recognize all currently supported DTDs. This is the default behavior.

XmlKnownDtd.None specifies that the XmlPreloadedResolver will not recognize any of the predefined DTDs.

Note
When the XmlPreloadedResolver preloads a well-known DTD, it does not invoke network connections because the DTDs are already embedded in the System.Xml.Utils assembly.

 Classes

	Class	Description
	XmlPreloadedResolver	The XmlPreloadedResolver type is used to prepopulate the cache with DTDs or XML streams.

 Enumerations

	Enumeration	Description
	XmlKnownDtds	The XmlKnownDtds enumeration is used by the XmlPreloadedResolver and defines which well-known DTDs that the XmlPreloadedResolver recognizes.