DITA provides two
addressing mechanisms. DITA addresses either are direct URI-based addresses, or they are
indirect key-based addresses. Within DITA documents, individual elements are addressed by
unique identifiers specified on the @id attribute. DITA defines two
fragment-identifier syntaxes; one is the full fragment-identifier syntax, and the other is
an abbreviated fragment-identifier syntax that can be used when addressing non-topic
elements from within the same topic.