The purpose of the ITU-T Recommendation T.410-Series | ISO/IEC 8613 is to facilitate the interchange of documents. In the context of these Recommendations | International Standards, documents are considered to be items such as memoranda, letters, invoices, forms and reports, which may include pictures and tabular material. The content elements used within the documents may include graphic characters, raster graphic elements and geometric graphic elements, all In addition to the content type defined in these Recommendations | International Standards, ODA also provides for arbitrary content types to be included in documents. These Recommendations | International Standards apply to the interchange of documents by means of data communications or the exchange of storage media. These Recommendations International Standards provide for the interchange of documents for either or both of the following purposes within one document. to allow presentation as intended by the originator; to allow processing, such as editing and reformatting. The composition of a document in interchange can take several forms: formatted form, allowing presentation of the document; processable form, allowing processing of the document; formatted processable form, allowing both presentation and processing. These Recommendations | International Standards also provide for the interchange of ODA information structures used for the processing of interchanged documents. This Recommendation | International Standard: defines a document architecture, in order to allow presentation and processing of tabular material, that can be used in conjunction with the document architecture defined in ITU-T Recommendation T.412 | ISO/IEC 8613-2; defines two types of components, the grid logical component and the grid frame component, which are characterized by association with grids; defines the layout attributes and layout directive attributes, in order to allow representation of tabular layout, applicable to this document architecture; defines the presentation attributes, in order to allow presentation of tabular layout, applicable to the content architectures defined in ITU-T Recommendation T.416 | ISO/IEC 8613-6, ITU-T Recommendation T.417 | ISO/IEC 8613-7, and ITU-T Recommendation T.418 | ISO/IEC 8613-8; describes reference models of the document layout process and the document imaging process which, together with the document processing model described in ITU-T Recommendation T.412 | ISO/IEC 86 13-2, determine representation and presentation of tabular layout.