These rules may be laid out in one of three primary formats: Document Type Definition (DTD), XML Schema, and XML Data Reduced (XDR) Schema.
In all three cases, the basic approach is the same.
They also allow you to work with modules and perform multiple validations with one action.
By default, the validation of a document is done by using a processor (XML parser, XSLT transformer, XQuery engine, etc.) to analyze the current file.
XSLT stylesheets, as is the case with many other XML-related technologies (XQuery, Relax NG, etc.), can be invalid by themselves, yet valid in the context of being imported or included in other files.
For instance, you can have an XSLT stylesheet that makes a reference to a named template or variable that is not defined in the current file, but it is defined in the Master File that includes the XSLT stylesheet.
This article demonstrates how to determine at runtime whether a string containing an XML document is valid, or adheres to the expected rules for document structure and syntax.
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Suppose that you are working with a large XML document that you decide to split into multiple files and use external entities to merge those files into a master document.
If you edit one of those files then you would want to check that the master document is valid.
Oxygen Validation Scenarios allow you to validate the master document instead of only validating the current file.
Thus, the current file is validated in the context of its Master File.
There are two different measures of correctness of an XML document: well-formed and valid.