Where can XPointer point?

XPointer is intended to point to XML-based media types. Standard excerpt: "The framework is intended to be used as a basis for fragment identifiers for any resource whose Internet media type is one of text/xml, application/xml, text/xml-external-parsed-entity, or application/xml-external-parsed-entity."

http://www.zvon.org/xxl/XPointerTutorial/Output/ser_framework_st0.html