The invention relates to a method for administrating a data base comprising a document set, a schema and a repository. The data base comprises a structure index, into which a document reference and, assigned to said document reference, at least one structure path reference of the referenced document is mappable as supplementary path reference. Further at least one schema path reference is mappable into the structure index as missing path reference. The invention relates to a data base. The data base is installed for administration by the inventive administration method. The invention relates to a computer system with a storage unit and a central processing unit. The storage unit of the computer system includes a data base, which is administrated according to the invention by means of the central processing unit.