Organization of publishers that have defined various standard DTDs for SGML, which have been used as the basis for the latest ISO DTDs.
A hypertext link that identifies a resource by its full address.
An XPath navigation method that locates an object by its unique identifier, rather than by its contextual location.
An SGML concept not applicable to XML that allows SGML markup syntax to be configurable, so that a start-tag could, for example, be described by '[para]' instead of '<para>'.
A diacritical mark that modifies a base letter. For example, 'é'. The ISOlat1 set of entities