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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 syntax constraints imposed by XML itself. An XML schema provides a view of the document type at a relatively high level of abstraction. The Extensible Markup Language (XML) is a general-purpose markup language. ...
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. Two other very popular, more expressive XML schema languages are XML Schema (W3C) and RELAX NG. Document Type Definition (DTD), defined slightly differently within the XML and SGML specifications, is one of several SGML and XML schema languages, and is also the term used to describe a document or portion thereof that is authored in the DTD language. ...
XML Schema, published as a W3C Recommendation in May 2001, is one of several XML schema languages. ...
In computing, RELAX NG (REgular LAnguage for XML Next Generation) is a schema language for XML, based on Murata Makotos RELAX and James Clarks TREX. A RELAX NG schema specifies a pattern for the structure and content of an XML document. ...
The mechanism for associating an XML document with a schema varies according to the schema language. The association may be achieved via markup within the XML document itself, or via some external means.
Validation
The process of checking to see if an 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. DTD-validating parsers are most common, but some support W3C XML Schema or RELAX NG as well. The XML Validation (eXtensible Markup Language) checks a document in XML language if it is well formed and it is adjusted to a defined structure. ...
Documents are only considered valid if they satisfy the requirements of the schema with which they have been associated. These requirements typically include such constraints as:
- Elements and attributes that must/may be included, and their permitted structure;
- The structure is specified by a regular expression syntax ;
- How character data is to be interpreted, e.g. as a number, a date, a URL, a Boolean, etc.
XML Schema validations can be effectively performed using specialized parsers, like JAXB or SAX. In computing, a regular expression is a string that is used to describe or match a set of strings, according to certain syntax rules. ...
A number is an abstract idea used in counting and measuring. ...
A date in a calendar is a reference to a particular day represented within a calendar system. ...
A Uniform Resource Locator, URL (spelled out as an acronym, not pronounced as earl), or Web address, is a standardized address name layout for resources (such as documents or images) on the Internet (or elsewhere). ...
In computer science, the Boolean datatype, sometimes called the logical datatype, is a primitive datatype having two values: one and zero (which are equivalent to true and false). ...
Java Architecture for XML Binding (JAXB) allows Java developers to edit and create XML using familiar Java objects. ...
Look up sax in Wiktionary, the free dictionary. ...
XML schema languages Document Definition Markup Language (DDML) is an XML schema language proposed in 1999 by various contributors from the xml-dev electronic mailing list. ...
Document Schema Definition Languages (DSDL) is a framework within which multiple validation tasks of different types can be applied to an XML document in order to achieve more complete validation results than just the application of a single technology. ...
Document Structure Description, or DSD, is an XML schema language, for describing valid XML documents. ...
Document Type Definition (DTD), defined slightly differently within the XML and SGML specifications, is one of several SGML and XML schema languages, and is also the term used to describe a document or portion thereof that is authored in the DTD language. ...
Namespace Routing Language (NRL). ...
In computing, RELAX NG (REgular LAnguage for XML Next Generation) is a schema language for XML, based on Murata Makotos RELAX and James Clarks TREX. A RELAX NG schema specifies a pattern for the structure and content of an XML document. ...
There is also an album by Blur called Leisure. ...
The word Trex has the following meanings: Trex a composite material. ...
The Standard Generalized Markup Language (SGML) is a metalanguage in which one can define markup languages for documents. ...
Schema for Object-Oriented XML, or SOX, is an XML schema language developed by Commerce One. ...
The Schematron is an XML structure validation language for making assertion about the presence or absence of patterns in trees. ...
XML Schema, published as a W3C Recommendation in May 2001, is one of several XML schema languages. ...
See also A binary tree, a simple type of branching linked data structure. ...
This article does not cite any references or sources. ...
This is a list of XML schemas in use on the Internet sorted by purpose. ...
XML Information Set (Infoset) is a W3C recommendation. ...
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 syntax constraints imposed by XML itself. ...
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