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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.
A namespace name is a uniform resource identifier (URI). Typically, the URI chosen for the namespace of a given XML vocabulary describes a resource under the control of the author or organization defining the vocabulary, such as a URL for the author's Web server. However, the namespace specification does not require nor suggest that the ...
The process of checking to see if a XML document conforms to a schema is called validation, which is separate from XML's core concept of syntactic well-formedness.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.
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.
Alternatives to DTDs (for specifying schemas) are available: XML Schema, also referred to as XML Schema Definition (XSD), has achieved Recommendation status within the W3C, [8] and is popular for "data oriented" (that is, transactional non-publishing) XML use because of its stronger typing and easier round-tripping to Java declarations.
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 ...
XML CoverPage; W3C's Web Services Activity; XML specification. XML (eXtensible Markup Language) XML Namespaces; XML Schema; XPath; XQuery; XML Information Set; XInclude;
XML-SW (SW for skunkworks), which one of the original developers of XML has written, [42] contains some proposals for what an XML 2.0 might look like, including elimination of DTDs from syntax, as well as integration of XML namespaces, XML Base and XML Information Set into the base standard.