Validating xsd

Posted by / 18-Apr-2019 19:16

Validating xsd

Two more expressive XML schema languages in widespread use are XML Schema (with a capital S) and RELAX NG.The mechanism for associating an XML document with a schema varies according to the schema language.A schema is analogous to a grammar for a language; a schema defines what the vocabulary for the language may be and what a valid "sentence" is.There are historic and current XML schema languages: The main ones (see also the ISO 19757's endorsed languages) are described below.Both allow for a degree of modularity in their languages, including, for example, splitting the schema into multiple files.And both of them are, or can be, defined in RELAX NG does not have any analog to PSVI.

Each language has its own advantages and disadvantages.For WXS validators that will follow a URI to an arbitrary online location, there is the potential for reading something malicious from the other side of the stream.W3C XML Schema does not implement most of the DTD ability to provide data elements to a document.RELAX NG has no ability to apply default attribute data to an element's list of attributes (i.e., changing the XML info set), while W3C XML Schema does.Again, this design is intentional and is to separate validation and augmentation.

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W3C XML Schema is complex and hard to learn, although that's partially because it tries to do more than mere validation (see PSVI).

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