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2.3 Document Parts

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The range of CPs in a document is separated into multiple logical parts. Many features operate within the individual parts and use CPs relative to the beginning of the part in which they operate rather than relative to the beginning of the document. This section defines the document parts and specifies the corresponding range of CPs.

All documents MUST include a non-empty Main Document part. In addition, if any of the other document parts are non-empty, the document MUST include one additional paragraph mark character (Unicode 0x000D) beyond the end of the last non-empty document part. That character is not displayed to or editable by the user, because it is outside of any document part.