Llista d'encapçalaments de matèria en català

The Llista d'encapçalaments de matèria en català (LEMAC) is a Catalan language controlled vocabulary that includes subject headings – linguistic expression (a term or a phrase)- used by cataloguers to represent the thematic content of documents – a concept, event, name, or title- and that allows users to make a search in a catalogue, bibliography or index. LEMAC is created and maintained by the Servei de Normalització Bibliogràfica of the National Library of Catalonia (Biblioteca de Catalunya), and it is applied by librarians to the documents being catalogued, so that users can search items through access points other than authors, titles or publishers. Subject headings also allow users to retrieve headings together when the topic is the same and, at the same time, they show the topics covered in a given collection. LEMAC was developed following the spirit of the Llei 4/1993 del Sistema Bibliotecari de Catalunya (Catalan Library System Law) in order to “gather in a same union catalogue the bibliographic references integrating the different library resources of the Sistema Bibliotecari de Catalunya”.