Discovery

Content Standard for Digital Geospatial Metadata (version 2.0)
http://www.fgdc.gov/.../v2_0698.pdf
Recommendation for Search Interoperability, Categorization of Government Information (CGI)
Working Group U.S. Federal Interagency Committee on Government Information
http://www.cio.gov/.../recommendation.html
US LOC SRW Maintenance Agency Releases Search/Retrieve Web Service Version 1.1.
http://xml.coverpages.org/ni2004-03-04-a.html