This page lists specific source data elements and provides information on their representation in the UMLS Metathesaurus.
LCH_NW is a new source.
All files are available here: http://files.library.northwestern.edu/public/lcshmesh/
Additional documentation on the MARC 21 Format For Authority Data can be found here: http://www.loc.gov/marc/authority/
|lcsh-mesh_read.doc||Description of the project and files|
|lcsh.mrc||MARC 21 format authority file, with linking data to MSH strings|
||Library of Congress Control Number||MRCONSO.CODE
||Canceled/invalid LC control number
||Not included in Metathesaurus source processing
|Heading - Topical Term, Heading - Geographic Name
name entry element
CODE = Value of tag = 010, subfield $a
TTY = PT
SUPPRESS = N
MRCONSO.STR is assembled by using "--" to concatenate the values of the $a, $x, $v, $y and $z subfields.
||Established Heading Linking Entry.
A 2nd indicator value of "2" indicates a MSH mapping.
|MRREL.REL = RQ
MRREL.RELA = mapped_from
MRMAP.TOEXPR = SDUI of string of $a value
Note: the original data in this field is populated by MSH strings. Where possible, the strings have been translated to MSH identfiers. In a small number of cases, the string provided did not correspond to a current MSH string, and these entries were dropped during Metathesaurus source processing.
||Indicates a MSH qualifier
||MRMAP.TOEXPR = MSH SDUI values, in the format "Descriptor Identifier/Qualifier Identifier"
||field link/sequence number; indicates that one LCH concept maps to two or more MSH entity||MRMAP.TOEXPR = MSH SDUI values with the same sequence number, connected by "AND"
MRMAP.TOTYPE = BOOLEAN_EXPRESSION_SDUI
MRMAP.MAPRANK is incremented if there is more than one grouping (i.e. if the sequence number is incremented).