Validating non validating parser xml
Validating non validating parser xml - Cam america sex
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.
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.This may be by mapping the XSD-defined types to types in a programming language such as Java ("data binding") or by enriching the type system of XML processing languages such as XSLT and XQuery (known as "schema-awareness").RELAX NG and W3C XML Schema allow for similar mechanisms of specificity.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.Validation of an instance document against a schema can be regarded as a conceptually separate operation from XML parsing.
In practice, however, many schema validators are integrated with an XML parser.
Though there are a number of schema languages available, the primary three languages are Document Type Definitions, W3C XML Schema, and RELAX NG.
Each language has its own advantages and disadvantages.
There are languages developed specifically to express XML schemas.
The Document Type Definition (DTD) language, which is native to the XML specification, is a schema language that is of relatively limited capability, but that also has other uses in XML aside from the expression of schemas.
DTDs are perhaps the most widely supported schema language for XML.