2.1.858 Part 1 Section 18.16.4, Schema (XML Schema)

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a.   The standard does not limit the length of the value of the ID attribute.

Excel restricts the value of this attribute to be at most 65535 characters.

b.   The standard does not limit the length of the value of the SchemaRef attribute.

Excel restricts the value of this attribute to be at most 65535 characters.

c.   The standard does not limit the length of the value of the Namespace attribute.

Excel restricts the value of this attribute to be at most 65535 characters.

d.   The standard does not specify a minOccurs value for the any element.

Excel sets this value to be 0.

e.   The standard states that the SchemaLanguage attribute is a valid attribute, and that it specifies the media type of the schema language.

Office ignores the SchemaLanguage attribute, and assumes that any Custom XML Mappings (as specified in Section 18.16) use XML Schema (media type application/xml).

f.   The standard states that the complex type for the schema element defines its mixed attribute as true.

Excel ignores the mixed attribute on the schema element.