The broad goal of RDF is to define a mechanism for describing resources that makes no assumptions about a particular application domain, nor defines the semantics of any application domain.
Entities associate a name with a string of literal text.
External Entities associate a name with the content of another file. 1.emphasis on descriptive rather than procedural markup 2. Text-oriented database management systems 3. No separation between form purpose and presentation. XForms, are comprised of separate sections that describe what the form does, and how the form looks.