u The DTD is the contract how to find data in the document base
u Major DTD types:
u Layout oriented DTD
focus on redition
oriented on capabilities of publishing tools
suitable for layout oriented document base
u Presentation oriented DTD
focus on presentation structures
flexible layout on different media
appropriate for presentation oriented document base
u Database oriented DTD
representing data models
essential for data exchange on all levels
u The character of the required DTDs is determined by the
objectives on the document base