The purpose of ISO 8613 is to facilitate the interchange of documents, where they are considered to be items such as memoranda, letters, invoices, forms and reports, which may include pictures and tabular material. The content parts used within the documents may include graphic characters, geometric graphics elements and raster graphics elements, all may be within one document. It applies to the interchange of documents by means of data communications or the exchange of storage media, and provides for the interchange of documents for presentation as intended by the originator or processing such as editing and reformatting. Gives a formal description technique appropriate for describing the technical specifications of the document structures, the document profile and the content architectures.