Validating against xsd schema
Validating against xsd schema - Interracial bi sexual chat
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Because DTDs are one of the earliest schema languages for XML, defined before XML even had namespace support, they are widely supported.
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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.
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.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.Internal DTDs are often supported in XML processors; external DTDs are less often supported, but only slightly.Most large XML parsers, ones that support multiple XML technologies, will provide support for DTDs as well.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.