+ Well Defined Query Language
+ Deployed Servers
- Limited Scope (Non extensible)
- Complicated Protocol / Hard Servers, Fat Client
Topic Maps (ISO/IEC 13250) GPS of the information universe
Alternative definition of problem
atomic topics, user-defined associations within specfic scope
+ Has well-defined schema
+ Multiple topic map integration
- No subclassing
- Not well supported
- SGML / Hytime ( XML / XPath )
RDF information about information
+ Powerful Link Language
+ Pretty Well supported
+ Explicit Web Space Interconnectivity
+ Objects, Properties, Subclasses
- Needs schema
The schema is the specification
- No query language
LDAP, SOAP, CORBA, etc.
Not necessarily exclusive