OASIS grammar files This section provides information about the grammar files that are provided in the DITA base edition. File names in the base DITA editionThe OASIS DITA Technical Committee uses certain conventions for the names of XML grammar files. We suggest using these conventions as a way to facilitate the interchange of grammar files.Globally-unique identifiers in the base DITA editionEach DITA grammar file has a globally-unique identifier. This identifier can reference either the latest version or a specific version of the grammar file.Domains provided in the base DITA editionThe base DITA edition includes a set of attribute- and element-domain specializations. The attribute domains are available for use in both maps and topics, while the element domains vary as to where they can be made available.Document-type shells provided in the base DITA editionThe DITA specification contains a starter set of document-type shells. These document-type shells are commented and can be used as templates for creating custom document-type shells.