discovery requirements

[Kralidis,Tom [Burlington]]

Following the discussions on cataloguing, it may be a good idea outline
what we would want a catalogue to do.

1./ discover the existence of a web service
2./ discover the existence of a resource which is available via web
services (i.e WMS layer, WFS feature type)
3./ discover the existence of a static resource (dataset, document,
etc.)
4./ ability to performs operations 1 - 3 with spatial, aspatial and
temporal predicates
5./ provide a RESTful request API
6./ provide responses in XML

Just a start.  Feel free to add/modify, etc.

..Tom