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XML Schema, published as a W3C recommendation in May 2001, [2] is one of several XML schema languages. It was the first separate schema language for XML to achieve Recommendation status by the W3C.
XML namespaces are used for providing uniquely named elements and attributes in an XML document. They are defined in a W3C recommendation . [ 1 ] [ 2 ] An XML instance may contain element or attribute names from more than one XML vocabulary.
W3C XML Schema is complex and hard to learn, although that is partially because it tries to do more than mere validation (see PSVI). Although being written in XML is an advantage, it is also a disadvantage in some ways. The W3C XML Schema language, in particular, can be quite verbose, while a DTD can be terse and relatively easily editable.
In XML, the XML namespace specification enables the names of elements and attributes in an XML document to be unique, similar to the role of namespaces in programming languages. Using XML namespaces, XML documents may contain element or attribute names from more than one XML vocabulary.
Most XML schema languages are only replacements for element declarations and attribute list declarations, in such a way that it becomes possible to parse XML documents with non-validating XML parsers (if the only purpose of the external DTD subset was to define the schema). In addition, documents for these XML schema languages must be parsed ...
A QName, or qualified name, is the fully qualified name of an element, attribute, or identifier in an XML document. A QName concisely associates the URI of an XML namespace with the local name of an element, attribute, or identifier in that namespace. [1] To make this association, the QName assigns the local name a prefix that corresponds to ...
Originally, the namespace name could match the syntax of any non-empty URI reference, but the use of relative URI references was deprecated by the W3C. [31] A separate W3C specification for namespaces in XML 1.1 permits Internationalized Resource Identifier (IRI) references to serve as the basis for namespace names in addition to URI references ...
Namespace-based Validation Dispatching Language (NVDL) is an XML schema language for validating XML documents that integrate with multiple namespaces. It is an ISO/IEC standard, and it is Part 4 of the DSDL schema specification. Much of the work on NVDL is based on the older Namespace Routing Language.