× Information on this section of ECOLEX comes from the InforMEA Portal which compiled information from MEA Secretariats with the support of the European Union. The accuracy of the information displayed is the responsibility of the originating data source. In case of discrepancy the information as displayed on the respective MEA website prevails. Criteria for the inclusion of cultural properties in the World Heritage List Tipo de documento Decision Número de referencia VI.A(c).30 Fecha Jun 27, 1977 FuenteUNEP, InforMEA Estado Activo Materia Especies silvestres y ecosistemas Tratado Convención para la Protección del Patrimonio Mundial, Cultural y Natural (Nov 23, 1972) Reunión 1ère session du Comité Página web whc.unesco.org Resumen The interpretation given of authenticity was challenged by several members who did not consider that it necessarily entailed maintaining the original function of property which, to ensure its preservation, often had to be adapted to other functions. Another member specified that functions could change but when this different function entailed fundamental and irreversible changes to the original form, authenticity should be considered as lost. The same member went on to plead that due recognition be given to "progressive authenticity", for example, monuments and buildings that are constructed or modified throughout the centuries but which nevertheless retain some form of authenticity.