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Rules Rule elements define a collection of constraints on a particular context in a document instance (for example, on an element or collection of elements).

This is very similar to XSLT templates, which are fired with respect to a node or group of nodes returned by an XPath expression.

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You can read more about JSON Schema at Internally Is Valid uses Json Validating Reader to perform the JSON Schema validation.

JSON Schema is used to validate the structure and data types of a piece of JSON, similar to XML Schema for XML.

XML schemas are necessary for communicating the structure of an XML document type to a machine. A person can easily interpret and understand both XML instances from the words used to describe their components.

A person can verify if the documents adhere to a set conventions about how vehicle elements should be used.

Most XML technologies (RDF, XSLT, and XLink) and schema languages (RELAX, XML Schema, SOX) are represented as XML.

This uniformity helps make these technologies easy to learn, and it means developers are able to leverage existing XML tools.

Consider the following XML: If one constraint on such a document is that a short Story element may only contain an author attribute if it isn't the child of anthology element, it wouldn't be possible to represent that constraint in a DTD.

These DTD handicaps aren't going unnoticed, and the W3C is presently developing an XML Schema language (currently a W3C Candidate Recommendation) that is more expressive and powerful than DTDs.

If we go back to the XSLT stylesheet we defined earlier: and then instantiate the template relative to the short Story element.

The contents of a rule element operate within the context of the elements matched by its context attribute.

I've found Schematron to be the most promising of these.

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