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The identity transformation can be modified to copy everything from an input tree to an output tree except a given node. For example, the following will copy everything from the input to the output except the social security number:
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The "copy with recursion" permits, changing little portions of code, produce entire new and different output, filtering or updating the input. Understanding the "identity by recursion" we can understand the filters.
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This version is equivalent to the first, but explicitly enumerates the types of XML nodes that it will copy. Both versions copy data that is unnecessary for most XML usage (e.g., comments).
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Finally, note that markup details, such as the use of CDATA sections or the order of attributes, are not necessarily preserved in the output, since this information is not part of the
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The typeswitch transform is sometime preferable since it can easily be modified by simply adding a case statement for any element that needs special processing.
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can define recursive functions. The following example XQuery function copies the input directly to the output without modification.
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instruction that allows the identity transform to be declared rather than implemented as an explicit template rule. Specifically:
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matches text, processing instructions, root, and comments, as well as elements, all XML nodes are copied.
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identity, is that it can take either one document like this example or a sequence of document as input.
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Generally the identity transform is used as a base on which one can make local modifications.
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can be easily maintained. These filters can be chained together in a format similar to
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W3.org - XSL Transformations
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The same function can also be achieved using a typeswitch-style transform.
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A more explicit version of the identity transform is:
1117:Two simple and illustrative "copy all" transforms.
522:XSLT 3.0 specifies an on-no-match attribute of the
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1613:Priscilla Walmsley,
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62:Model transformation
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1595:Further reading
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147:Data conversion
131:Data refinement
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1601:XSLT Cookbook
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307:December 2022
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268: –
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262:Find sources:
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1589:XML pipeline
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1292:Using XQuery
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249:Please help
244:verification
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139:Applications
125:
72:Preprocessor
47:Data mapping
42:Data element
1533:Using XProc
1178:Using XProc
1681:Transforms
1670:Categories
1622:References
1231:Using XSLT
1136:xmlns:xsl=
1121:Using XSLT
1065:local:copy
915:local:copy
882:typeswitch
819:local:copy
761:local:copy
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365:Using XSLT
277:newspapers
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1578:See also
1548:xmlns:p=
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446:. Since
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37:Metadata
29:Concepts
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176:Related
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