DocumentID: ECMA-376/Part1/9.1.9
Title: ECMA-376, Part1: 9.1.9 Unknown Relationships
Extracted-From: ECMA-376 Office Open XML File Formats, 1st Edition / December 2006
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9.1.9 Unknown Relationships

All relationships not defined within this Standard are considered unknown relationships. Unknown relationships are valid within an Office Open XML document provided that they conform to relationship markup guidelines as defined by the OPC specification. Specifically:

• Conforming consumers shall not fail to load a document containing unknown relationships.
• Conforming producers are encouraged to roundtrip and preserve unknown relationships and their target parts.