Handling of source documents

A number of interfaces now recognize the "data" URI scheme, defined in RFC 2397. This allows the actual content of a resource to be contained directly in the URI, using either %HH or base64 encoding.

Specifically, "data" URIs are recognized:

• By the StandardURIResolver, allowing them to be used by the doc() and document() functions (as well as other less useful places, like xsl:include and xsl:import)
• By the StandardUnparsedTextResolver, allowing use in unparsed-text() and unparsed-text-lines()
• In a collection catalog, allowing use in the collection() function.

Applications using user-written URI resolvers or collection finders can take advantage of the same features by reference to the class DataURIScheme, which converts a Base64 "data" URI into a BinaryResource, and any other "data" URI into an UnparsedTextResource.