Annotation namespaces

[tclose]

It was decided at the NineML meeting in Antwerp to allow all NineML flags to accept "Annotation" elements. These annotations are planned to serve several purposes (among others potentially)

• House comments and meta-data, probably via RDF (see #23)
• Store information about the canonical model in flattened structures
• Provide hints about the structure of the model, which can be used by the simulator to optimise its performance.

We will need to draw up some guidelines/examples on how each of these systems will work.

[NineML-Committee]

All annotations should be within their own namespace, and it is up to the simulator/extension to define the tags used from there.