+(defvar +relationship-abbreviations+
+ '(("RB" "Broader" "has a broader relationship")
+ ("RN" "Narrower" "has a narrower relationship")
+ ("RO" "Other related" "has relationship other than synonymous, narrower, or broader")
+ ("RL" "Like" "the two concepts are similar or 'alike'. In the current edition of the Metathesaurus, most relationships with this attribute are mappings provided by a source")
+ ("RQ" "Unspecified" "unspecified source asserted relatedness, possibly synonymous")
+ ("SY" "Source Synonymy" "source asserted synonymy")
+ ("PAR" "Parent" "has parent relationship in a Metathesaurus source vocabulary")
+ ("CHD" "Child" "has child relationship in a Metathesaurus source vocabulary")
+ ("SIB" "Sibling" "has sibling relationship in a Metathesaurus source vocabulary")
+ ("AQ" "Allowed" "is an allowed qualifier for a concept in a Metathesaurus source vocabulary")
+ ("QB" "Qualified" "can be qualified by a concept in a Metathesaurus source vocabulary")))
+