dao.document.fields.id_doc          = Document identifier
dao.document.fields.id_head         = Heading identifier
dao.document.fields.caption_head    = Heading caption
dao.document.fields.title_doc       = Document title
dao.document.fields.nameindex_doc   = Document name index
dao.document.fields.desc_doc        = Document description
dao.document.fields.status_doc      = Document status
dao.document.fields.weight_doc      = Document weight
dao.document.fields.extension_doc   = Document extension
dao.document.fields.datepublish_doc = Publication date for the document
dao.document.fields.version_doc     = Document version