A generic fragment identifier syntax for URI references
The Open Healthcare Group
URI references with fragment identifiers uniquely identify parts of a document. Such identifiers have been specified as SGML/XML IDs e.g. in HTML [6]. The XPointer [2] specification is intended to serve as a fragment identifier syntax for XML documents. IDs conform to the XPointer 'raw name' form. Specifications constraining the behavior of user agents such as SMIL [8], XHTML [15], and SVG [10] have all supported this simple fragment naming convention though some extend it.