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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.

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All XML documents must be well-formed, but it is not required that a document be valid unless the XML parser is "validating", in which case the document is also checked for conformance with its associated schema.

DTD-validating parsers are most common, but some support XML Schema or RELAX NG as well.

An XML schema is a description of a type of XML document, typically expressed in terms of constraints on the structure and content of documents of that type, above and beyond the basic syntactical constraints imposed by XML itself.

These constraints are generally expressed using some combination of grammatical rules governing the order of elements, Boolean predicates that the content must satisfy, data types governing the content of elements and attributes, and more specialized rules such as uniqueness and referential integrity constraints.

There are several different languages available for specifying an XML schema. The primary purpose of a schema language is to specify what the structure of an XML document can be.

This means which elements can reside in which other elements, which attributes are and are not legal to have on a particular element, and so forth.

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.

Unlike W3C XML Schema, RELAX NG was designed so that validation and augmentation (adding type information and default values) are separate.

W3C XML Schema has a formal mechanism for attaching a schema to an XML document, while RELAX NG intentionally avoids such mechanisms for security and interoperability reasons.

Internal DTDs are often supported in XML processors; external DTDs are less often supported, but only slightly.

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