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Use the latter to supply one part of those settings, specifically those that apply to markup compatibility. Use the former to provide settings that apply to SDK behavior overall. The two classes are OpenSettings and MarkupCompatibilityProcessSettings. The Open XML SDK support for markup compatibility comes primarily in the form of two classes and in the manner in which content is preprocessed in accordance with ECMA-376, Second Edition. The preprocessing performed is in accordance with ECMA-376, Second Edition: Part 3.13. Process any markup compatibility elements and attributes as specified in the Open XML specification.
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Filter or remove any elements from namespaces that will not be understood (for example, Office 2013 document opened in Office 2010 context).However, the goal can be summarized as: using settings that you assign when you open a document, preprocess the document to: The work that the Open XML SDK does for markup compatibility is detailed and subtle. Open XML SDK support for markup compatibility The complete list of compatibility-rule attributes and alternate-content elements and their details can be found in the specification. For example, Word 2013 can choose only the markup alternative that it recognizes. Alternate-Content elements specify markup alternatives that can be chosen by an application at run time. For example, the Ignorable attribute specifies namespaces that can be ignored when they are not understood by the consuming application. The specification defines XML attributes to express compatibility rules, and XML elements to specify alternate content. Markup compatibility is discussed in ECMA-376, Second Edition, Part 3 - Markup Compatibility and Extensibility, which is recommended reading to understand markup compatibility. Markup compatibility in the Open XML file formats specification
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In other words, interoperability is a function of support both in the file format and by applications. Notice that while the markup is supported in the document format, markup producers and consumers, such as Microsoft Word, must support it as well. This is supported through the use of a defined set of XML elements and attributes in the Markup Compatibility namespace of the Open XML specification. With respect to the Open XML file formats, markup compatibility is the ability for a document expressed in one of the above markup languages to facilitate interoperability between applications, or versions of an application, with different feature sets. Open XML defines formats for word-processing, spreadsheet and presentation documents in the form of specific markup languages, namely WordprocessingML, SpreadsheetML, and PresentationML. The Open XML SDK supports markup compatibility in a way that makes it easy for you to achieve the above desired outcomes for and Office 2013 without having to necessarily become an expert in the specification details. The Office Open XML File Formats specification describes facilities for achieving the above desired outcomes in ECMA-376, Second Edition, Part 3 - Markup Compatibility and Extensibility. That is, you want the later version of Office to understand and support a feature employed in a document produced by Word 2013. Here too, you want the document to work as expected.
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When you open that document in Microsoft Word 2010, an earlier version, what should happen? Ideally, you want the document to remain interoperable with Word 2010, even though Word 2010 will not understand the new feature.Ĭonsider also what should happen if you open that document in a hypothetical later version of Office. Suppose you have a Microsoft Word 2013 document that employs a feature introduced in Microsoft Office 2013. This topic introduces the markup compatibility features included in the Open XML SDK for Office.