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1.3.2 Content Parts and Ink

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Ink is stored in documents as an extension by using a part referenced by the relationship id attribute of a content part element. Some content part elements are described in [ISO/IEC29500-1:2016] section 17.3.3.2, 19.3.1.14, and 20.5.2.12. Other content part elements are themselves extensions (2.2.2). The content of the part contains XML that conforms to a subset of the syntax and semantics for the Ink Markup Language as described in [InkML], the W3C EMMA recommendation specification [EMMA], and other extended elements (2.1.4).