22.5 Custom XML Data Properties
This namespace defines the set of properties that can be associated with one or more custom XML parts within an Office Open XML document. A custom XML part is a part within an Office Open XML document, that contains arbitrary custom XML markup not necessarily defined by ISO/IEC 29500, and which is kept independent from the presentation-specific markup within the package.
[Rationale: It is often necessary to include custom XML semantics with an Office Open XML document, to store a complex set of properties (e.g., a document management system’s metadata) along with the file. This mechanism allows this custom XML to be stored in the document in a way that is independent of the type of document and separate from the presentation markup—only the custom XML is stored in this part. end rationale]
The properties that can be applied to a custom XML part are:
- A part ID
- (optionally) One or more associated custom XML schemas