Pragmatics: Labeling Resources
Traditional fixed set of security attributes
- UNIX file permissions, AFS ACLs, process handles
Separable security labels as metadata
- PICS labels, Resource Description Framwork (RDF)
- Deliverable in, with, or from third parties
Self-description of schemas
- Loadable rating scales or attribute vocabularies
Difficulty of binding to variable Web pages
- Languages, obsolescence, bundling together pages