The new spec was created in collaboration with NCAR's Community Data Portal group. It adds new types of information for "enhanced catalogs" to facilitate interaction with search services and digital libraries.
Annotated specification is at:http://www.unidata.ucar.edu/projects/THREDDS/techNew/catalog/InvCatalogSpec.html
Tutorial (not complete) is at: http://www.unidata.ucar.edu/projects/THREDDS/techNew/catalog/Primer.html The new spec is based on XML Schema. The schema is at http://www.unidata.ucar.edu/schemas/thredds/InvCatalog.1.0.xsd Changes from version 0.6:http://www.unidata.ucar.edu/projects/THREDDS/techNew/catalog/Changes1.0.txt
Thanks for any comments on this spec.