DocumentID: ECMA-376/Part2/10.4
Title: ECMA-376, Part2: 10.4 Schema Restrictions for Core Properties
Extracted-From: ECMA-376 Office Open XML File Formats, 1st Edition / December 2006
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10.4 Schema Restrictions for Core Properties

The following restrictions apply to every XML document instance that contains Open Packaging Conventions core properties:

1. Producers shall not create a document element that contains refinements to the Dublin Core elements, except for the two specified in the schema: <dcterms:created> and <dcterms:modified> Consumers shall consider a document element that violates this constraint to be an error. [M4.3]
2. Producers shall not create a document element that contains the xml:lang attribute. Consumers shall consider a document element that violates this constraint to be an error. [M4.4] For Dublin Core elements, this restriction is enforced by applications.
3. Producers shall not create a document element that contains the xsi:type attribute, except for a <dcterms:created> or <dcterms:modified> element where the xsi:type attribute shall be present and shall hold the value dcterms:W3CDTF, where dcterms is the namespace prefix of the Dublin Core namespace. Consumers shall consider a document element that violates this constraint to be an error. [M4.5]