<descriptor thcode="25"><thesaurus thcode="25" name="Thesaurus categories" scope="Characteristics of thesauri, including general subjects such as place or theme, and structural or functional characteristics such as hierarchy and transitivity." creator="pschweitzer@usgs.gov" rights="public domain" date="2015-02-12" codetype="number" prefix="thcat" uri="http://www.usgs.gov/science/ThesaurusCategory" tblname="thterm" nonpref="thtermnp" relterm="thtermrt" root_code="1" contact="pschweitzer"><category><term thcode="25" code="23" name="information representation" parent="2" scope="Terms indicating the content, format, or packaging of information that may be available."/><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/><term thcode="25" code="29" name="distinct labels" parent="26" scope="Preferred labels (descriptor texts) are distinct within the thesaurus. A concept can be specified either by its unique identifier (code) or by the text of its descriptor."/><term thcode="25" code="23" name="information representation" parent="2" scope="Terms indicating the content, format, or packaging of information that may be available."/><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/><term thcode="25" code="29" name="distinct labels" parent="26" scope="Preferred labels (descriptor texts) are distinct within the thesaurus. A concept can be specified either by its unique identifier (code) or by the text of its descriptor."/></category></thesaurus><term thcode="25" code="8" name="biological taxonomy" parent="5" scope="Terms indicate groups of organisms identified by names where the rules governing the specification and use of the names are defined by well known tradition or by governing bodies such as international commissions."/><uf><usefor name="systematics"/><usefor name="taxa"/><usefor name="taxon"/></uf><bt><term thcode="25" code="5" name="theme" parent="2" scope="Terms indicate domains of human concern, such as scientific discipline, societal problems, or characteristics of earth, space, oceans, and living things."/><term thcode="25" code="2" name="(subjects)" parent="1" scope="Distinct segments of human knowledge, such as place, time, or theme."/><term thcode="25" code="1" name="Categories" scope="Characteristics applicable to entire controlled vocabularies.  We expect these terms to help people decide which vocabularies to use for particular purposes in the absence of official guidance."/></bt></descriptor>