The URL that can be used to download the data contained in
                                      this data collection.
 
A reference to this resource in a non-IVOA identifier
                                   scheme, e.g., DOI or bibcode.
 
Information regarding the general content of the resource .
 
Extent of the content of the resource over space, time,
                                      and frequency.
 
The UTC date and time this resource metadata description
                               was created.
 
Information regarding the general curation of the resource .
 
the observatory or facility used to collect the data
                                      contained or managed by this resource.
 
The physical or digital manifestation of the information
                                       supported by a resource.
 
Unambiguous reference to the resource conforming to the IVOA
                                   standard for identifiers .
 
the Instrument used to collect the data contain or
                                      managed by a resource.
 
Information about rights held in and over the resource.
 
A short name or abbreviation given to the resource.
 
a tag indicating whether this resource is believed to be still
                               actively maintained.
 
A description of the tables that are part of this
                                      collection.
 
the full name given to the resource .
 
The UTC date this resource metadata description was last updated.
 
A numeric grade describing the quality of the
                                   resource description, when applicable, 
                                   to be used to indicate the confidence an end-user
                                   can put in the resource as part of a VO application
                                   or research study.
 
The VOResource XML schema version
                                against which this instance was written.