The definition for the ‘guid’ attribute obviously makes reference to mechanisms that are not defined by the OOXML text (especially the Globally word - is that a universal concept of some sort how the is the uniqueness of the instances ensured) Reading the definition of the associated ST_Guid simple type does not help. This must be clarified.

Provide a proper definition for the guid attribute or else remove it from the OOXML text.

page 1880, line 2 Part 4, Section 3.2.3 customWorkbookView (Custom Workbook View)

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Proposed Disposition of DIS 29500 Comment FR-0402 (Modified: 2007-11-26) The guid attribute states that the guid must conform to the ST_Guid type defined in Part 4, §3.18.41, which further specifies the format of the content as matching the regular expression pattern: \{[0-9A-F]{8}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{12}\}. Thus, the required format of a guid is clearly defined. However, as to how a guid is made globally unique is implementation defined. No change will be made to Part 4, §3.2.3, page 1,880, but the following note will be added to Part 4, §3.18.41, page 2865, line 11: This simple type defines a 128 bit Globally Unique Identifier (GUID). [Note: The mechanism for ensuring a GUID is unique is implementation defined. In some environments, a guid is known as a universally unique identifier (uuid). end note]