DocumentID: ECMA-376/Part1/10.1.2
Title: ECMA-376, Part1: 10.1.2 Office Open XML Native Extensibility Constructs
Extracted-From: ECMA-376 Office Open XML File Formats, 1st Edition / December 2006
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10.1.2 Office Open XML Native Extensibility Constructs

Clause 12 of Part 5 specifies the ability for a markup language to define additional constructs for extensibility of a specific markup language. Within the context of Office Open XML documents, the extLst element(s) defined in individual markup languages shall allow the round-tripping of all unknown content regardless of the state of the PreserveElements and PreserveAttributes elements. See Part 4 for additional information on the valid use of the extLst construct.