RDF
- does not define semantics, but...
- provides common basis for expressing semantics
- could be used to define meaning of XML tags
- E.g., meanings of exam, question and answer can be defined
- Defined as directed labelled graphs
- RDF currently consists of:
- RDF Model and Syntax: defines the general RDF data model and its XML encoding
- RDF Schema: provides means to define specific metadata vocabulary (e.g., Dublin Core for
digital libraries)