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Open Document Architecture
The Open Document Architecture (ODA) and interchange format (informally referred to as just ODA) is a free and open international standard document file format maintained by the ITU-T to replace all proprietary document file formats. ODA is detailed in the standards documents CCITT T.411-T.424, which is equivalent to ISO 8613.
==Format==
ODA defines a compound document format that can contain raw text, raster images and vector graphics. In the original release the difference between this standard and others like it is that the graphics structures were exclusively defined as CCITT raster image and Computer Graphics Metafile (CGM - ISO 8632). This was to limit the problem of having word processor and desktop publisher software be required to interpret all known graphics formats.
The documents have both logical and layout structures. Logically the text can be partitioned into chapters, footnotes and other subelements akin to HTML, and the layout fill a function similar to Cascading Style Sheets in the web world. The binary transport format for an ODA-conformant file is called ''Open Document Interchange Format'' (ODIF) and is based on the Standard Generalized Markup Language and Abstract Syntax Notation One (ASN.1).
One of the features of this standard could be stored or interchanged in one of three formats: Formatted, Formatted Processable, or Processable. The latter two are editable formats. The first is an uneditable format that is logically similar to Adobe Systems PDF that is in common use today.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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