ይሁን እንጂ በእውነታው የመነሻ ገጽ የመፈለጊያ ካርታ በተለያየ መልክ ነው የሚመስለው, ልክ ከፍለጋ ቃላቶች ማንኛውም ማጣቀሻዎች ያላቸው በጣም ትንሽ መልህቆች.
However, in a Web environment multiple resources use quite different metadata vocabularies: mapping between related terms in different vocabularies becomes very important, but has received relatively little attention.