"An XML property holds a valid fragment of Extensible Markup Language (XML) content."

Valid or well-formed? Escaped?

"An HTML property holds a valid fragment of Hypertext Markup Language (HTML) content."

Valid? According to which DTD? HTML4? XHTML? Escaped?

Examples please...

"For XML Types:

• URI SchemaURI This attribute is for properties of type "XML" only. It provides the URI location of an XML schema to which the property value MUST conform."

I'm not sure how exactly this is supposed to work if the property takes an XML fragment, such as "foo <i>bar</i>". I guess a minimal example would be extremely helpful.

Also, having a normative requirement on XML Schema well be a significant burden for implementations, so I'd like the TC to discuss whether this is really desirable.

"- String Encoding This attribute is for properties of type "XML" only. It specifies the encoding used for the property value (e.g. UTF-8, etc.)."

If the property is marshalled as XML or String everywhere, what exactly is this good for? Why do we need it for XML, but not for Strings.