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Media types, fragment identifiers, and XPointer

It appears that media types, fragment identifiers, and XPointer are 
actually related.

In my understanding, URIs can have fragment identifiers such as "#foo".  
How to interpret fragment identifiers depends on the media type.   (Could 
somebody provide pointers to relevant RFCs?)

On the other hand, the XML community is developing a mechanism called XPointer. 

	"XPointers operate on the tree defined by the elements and other 
	markup constructs of an XML document.

	An XPointer consists of a series of location terms, each of which 
	specifies a location, usually relative to the location specified by 
	the prior location term. Each location term has a keyword (such as id, 
	child, ancestor, and so on) and can have arguments such as an instance 
	number, element type, or attribute. For example, the location term 
	child(2,CHAP) refers to the second child element whose type is CHAP."

XPointer is intended to be used as a fragment identifier.

	"The locator for a resource is typically provided by means of a 
	Uniform Resource Identifier, or URI. XPointers can be used as fragment 
	identifiers in conjunction with the URI structure to specify a more precise 

I personally have expected that XPointer is usable for every XML document 
no matter what the media type is.  But I am apparently wrong.  Do we need 
a top-level media type "xml" or some convention such as "image/xml.vml" 
so that XPointer can be used for any XML document?  Or, are "text/xml" and 
"application/xml" enough?


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