xtm-implicit-constraints

Type(s): Issue

Description
- The XTM DTD contains a number of implicit constraints, such as that an addressable subject may not be used as a theme or a type. Should these constraints be mirrored in the SAM?
Opinion
- we should evaluate them and not be afraid to NOT model them in the same. i.e. constraints such as 'A Topic that *is* a resource cannot be a used as a scoping topic.'. I'm actually torn on this one. It seems like we'd be adding some sensible 'real-world' usage constraints. But this also prohibits people from doing cool funky things we havent thought of yet. - Scope: Graham Moore
Resolution
- The SAM should not necessarily attempt to mirror the constraints implied by the XTM 1.0 DTD.

Discussion
- http://www.y12.doe.gov/sgml/sc34/document/0331.htm#xtm-implicit-constraints

Object id: 587
Item identifier(s):
[file:/apps/ontopia.net/tomcat/ontopia-5.3.0/topicmaps/tm-standards.xtm#xtm-implicit-constraints]