prefixing scheme used in data.pointer values defines a prefixing scheme used in data.pointer values, showing how abbreviated URIs using the scheme may be expanded into full URIs. supplies the identifier which functions as the prefix for an abbreviated pointing scheme such as a private URI scheme. The prefix constitutes the text preceding the first colon. an XML name

In the context of this project, private URIs with the prefix "ref" point to div elements in the project's global references.xml file.

Where matchPattern and replacementPattern are both supplied, the abbreviated pointer may be dereferenced to produce either an absolute or a relative URI reference. In the latter case it is combined with the value of xml:base in force at the place where the cRef attribute occurs to form an absolute URI in the usual manner as prescribed by XML Base.