XML Base

XML Base (second edition), W3C Recommendation 28 Jan 2009: http://www.w3.org/TR/xmlbase/

Standard for evaluation of relative URLs in links to/from XML docs. Facility similar to that of HTML BASE, for defining base URIs for parts of XML documents.

Defines how to use a reserved attribute xml:base denoting the base URI for relative URIs.

It complements with the XLink spec.

It works based on "overriding" of XML base from parent (ancestor) elements.