DocumentID: ECMA-376/Part5/9
Title: ECMA-376, Part5: 9. Markup Compatibility Attributes and Elements
Extracted-From: ECMA-376 Office Open XML File Formats, 1st Edition / December 2006
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9 Markup Compatibility Attributes and Elements

This specification defines attributes to express compatibility rules and elements to specify alternate content.

[Note: Whitespace characters that can appear in attribute values, as defined in the XML specification, are described in the following table:

Table 9--1. Whitespace characters in attribute values

Character	Syntax
space	#x20
tab	#x9
line feed	#xA
carriage return	#xD

end note]

Whitespace characters that appear in values of attributes defined in this specification shall be normalized by markup consumers before processing as follows:

Replace each tab, line feed, and carriage return with a space.
Collapse contiguous sequences of spaces into a single space.
Remove leading and trailing spaces.

[Note: The following table, and Table 9--3, summarize the Markup Compatibility attributes and elements, respectively, and are further described in the sub-clauses that follow.

Table 9--2. Compatibility-rule attributes

Name	Description
`Ignorable`	A whitespace-delimited list of namespace prefixes that identify a set of namespaces whose elements and attributes should be silently ignored by markup consumers that do not understand the namespace of the element or attribute in question.
`ProcessContent`	A whitespace-delimited list of element-qualified names identifying the expanded names of elements whose content shall be processed, even if the elements themselves are ignored. In any qualified name in the list, the wildcard character "*" can replace the local name to indicate that the content of all elements in the namespace shall be processed.
`PreserveElements`	A whitespace-delimited list of element qualified names identifying the expanded names of elements that a markup producer suggests for preservation by markup editors, even if the elements themselves are ignored. In any qualified name in the list, the wildcard character "*" can replace the local name to indicate that all elements in the namespace should be preserved.
`PreserveAttributes`	A whitespace-delimited list of attribute qualified names identifying the expanded names of attributes that a markup producer suggests for preservation by markup editors. In any qualified name in the list, the wildcard character "*" can replace the local name to indicate that all attributes in the namespace should be preserved.
`MustUnderstand`	A whitespace-delimited list of namespace prefixes identifying a set of namespace names. Markup consumers that do not understand these namespaces shall not continue to process the markup document and shall generate an error.

Table 9--3. Alternate-content elements

Name	Description
`AlternateContent`	Associates a set of possible markup alternatives that a markup consumer might choose based on that markup consumer's understood namespaces. The markup consumer chooses the first alternative, in markup order, requiring only namespaces it understands.
`Choice`	This child of `AlternateContent c`ontains a single markup alternative and identifies the namespaces that the markup consumer needs to understand in order to choose and process that alternative. At least one `Choice` element is required.
`Fallback`	This child of `AlternateContent s`pecifies the fallback markup alternative a markup consumer chooses if the markup consumer cannot choose any `Choice` alternative. An `AlternateContent` element shall hold no more than one `Fallback` element, which if present, shall follow all `Choice` elements.

end note]

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