DocumentID: ECMA-376/Part1/9.1.6
Title: ECMA-376, Part1: 9.1.6 Unknown Parts
Extracted-From: ECMA-376 Office Open XML File Formats, 1st Edition / December 2006
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9.1.6 Unknown Parts

With the exception of relationship parts, all other parts in an Office Open XML document that are not the target of a valid relationship are considered unknown parts. Unknown parts shall be ignored on document consumption and can, but need not, be discarded on production.