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Topic: W3C XML Schema

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XSD

	XML Schema - Wikipedia, the free encyclopedia
		XML Schema, published as a W3C Recommendation in May 2001, is one of several XML schema languages.
		However, unlike most other schema languages, XML Schema was also designed with the intent of validation resulting in a collection of information adhering to specific datatypes, which can be useful in the development of XML document processing software, but which has also provoked criticism.
		After XML Schema-based validation, it is possible to express an XML document's structure and content in terms of the data model that was implicit during validation.
	en.wikipedia.org /wiki/XML_Schema (879 words)

	Introduction to XML Schema
		The schema language that has gained the most popularity is the W3C XML Schema Language, developed by the World Wide Web Consortium (W3C).
		As schema declarations for namespaces is complicated and cumbersome, and also unreliable because one must always have net access to validate against the namespace schema, I'll discuss only how to associate a schema with a particular.xsd file.
		The W3C XML Schema defines a number of built-in simple datatypes that can be used to restrict the contents of elements and attribute values, see the W3C Schema specification for a full list of all built-in simple types.
	www.isrl.uiuc.edu /~kmreiss/presentations/schematutorial (1455 words)

	RELAX NG and W3C XML Schema
		I believe the key function of a schema language in a specification of an XML application is to communicate unambiguously and precisely to a human reader what XML documents are legal for that application; it serves a similar role for XML that ABNF does for text.
		W3C XML Schema does not define a single notion of validity of a document with respect to a schema.
		W3C XML Schema provides the xsi:schemaLocation attribute, which allows an XML document instance to indicate the schema that should be used to validate the document.
	www.imc.org /ietf-xml-use/mail-archive/msg00217.html (2037 words)

	Combining Schematron with other XML Schema languages
		After the W3C ratified W3C XML Schema as a full recommendation on May 2nd 2001 it has become clear that this is the most used XML Schema language in the development community.
		W3C XML Schema has limited support for this through the identity constraint functionality, which can specify that one element or attribute's value should refer to another element or attribute.
		This means that the W3C XML Schema element declaration and the Schematron rule that apply to the element are declared in the same place.
	www.topologi.com /public/Schtrn_XSD/Paper.html (5901 words)

	Cover Pages: XML Schemas
		XML Schema allows the author to determine which parts of a document may be validated, or identify parts of a document where a schema may apply.
		The W3C XML Schema specification has advanced to the 'Proposed Recommendation' stage, indicating that "the specification is stable and that implementation experience has been gathered, showing that each feature of the specification can be implemented." The three-part document has been produced as part of the W3C XML Activity.
		XML Schema Part 1: Structures and XML Schema Part 2: Datatypes provide the complete normative description of the XML Schema definition language, and the primer describes the language features through numerous examples which are complemented by extensive references to the normative texts.
	www.oasis-open.org /cover/schemas.html (14472 words)

	W3C XML Schema Questionnaire
		XML 1.0 has a certain amount of stuff that everybody needs, but it also has a bunch of stuff that only some folks need; and the spec is hard to read, for what should be a simple language spec.
		A Schema is not much use to an application producing an XML document describing a purchase order from a database (does it generate by trial and error and then see if the result is valid according to the Schema?).
		Schemas are a key piece in the puzzle, and a good spec will making it happen sooner; I just hope it will be accessible to people who should do before they are done to.
	www.ibiblio.org /xql/tally.html (9261 words)

	RELAX NG home page
		A schema written in any of the supported schema languages can be converted into any of the other supported schema languages, except that W3C XML Schema is supported for output only, not for input.
		Trang aims to produce human-understandable schemas; it tries to preserve all aspects of the input schema that may be significant to a human reader, including the definitions, the way the schema is divided into files, annotations and comments.
		It does aims only to produce a RELAX NG schema that is equivalent to the input schema in the sense that it validates the same documents as the input schema; it does not aim to preserve information that is not significant for validation such as the use of definitions.
	relaxng.org (1162 words)

	XML.com: Using W3C XML Schema (Site not responding. Last check: 2007-10-12)
		The W3C XML Schema Definition Language is an XML language for describing and constraining the content of XML documents.
		This article is an introduction to using W3C XML Schemas, and also includes a comprehensive reference to the Schema datatypes and structures.
		There appears to be no special reason for this, but the W3C XML Schema Working Group has considered that it was simpler to impose a relative order to the definitions of the list of elements and attributes within a complex type, and that it was more natural to define the attributes after the elements.
	www.xml.com /pub/a/2000/11/29/schemas/part1.html (574 words)

	W3C XML Schema (Site not responding. Last check: 2007-10-12)
		XML Schema was approved as a W3C Recommendation on 2 May 2001 and a second edition incorporating many errata was published on 28 October 2004; see reference list for pointers.
		The XML Schema WG is currently working towards the completion of XML Schema 1.1, which is intended to be mostly compatible with XML Schema 1.0 and to have approximately the same scope, but also to fix bugs and make whatever improvements we can, consistent with the constraints on scope and compatibility.
		XML Regular expressions We are distributing an efficient, open source Unicode regular expression pattern matcher in a C library.
	www.w3.org /XML/Schema (5189 words)

	Cover Pages: W3C Publishes XML Schema Formalization.
		The document supplies formal a description of XML types and validity as specified by the recently-issued Proposed Recommendation XML Schema Part 1: Structures.
		Such unique identifiers may be useful to XML Query, RDF, and topic maps, among others; (3) Formally define validation at a declarative level; (4) Define the mapping from the current XML Schema syntax onto the structures described here, as well as the mapping between the XML Schema component mode and our component model.
		Many potential applications of XML Schema may benefit from the definition of a formal model.
	xml.coverpages.org /ni2001-03-21-b.html (436 words)

	Guidelines for using W3C XML Schema Datatypes with RELAX NG
		datatype of [W3C XML Schema Datatypes] and the
		The semantics defined by [W3C XML Schema Datatypes] for the
		Furthermore, the [XML 1.0] cross-reference semantics of these datatypes do not fit into the RELAX NG model of what a datatype is. Therefore, RELAX NG validation will only validate the lexical aspects of these datatypes as defined in [W3C XML Schema Datatypes].
	www.relaxng.org /xsd-20010907.html (511 words)

	XML.org
		XML involves an interesting perspective on data management, one which many developers find new and strange at first.
		The promised ease with which you can transform one XML format to another using XSLT leads to a cavalier philosophy: "Throw it all out as XML, and pick through for what you need." The problem is that this leaves the door wide open to security issues, such as XPath injection attacks.
		Applications that work with large dumps of XML data, and use complex processing to scratch needed information from these data sets, are vulnerable to a sophisticated attacker who takes advantage of your blind spots.
	www.xml.org (2126 words)

	W3C XML Schema: DOs and DON'Ts
		A document for those who use W3C XML Schema for business --- for those who are at a loss how to use it.
		Furthermore, you won't lose anything by losing complex types; the fact is, if a schema can be written by using complex types, then you can always write it without complex types.
		If you do know notations, then you should know that notations in W3C XML Schema are not compatible with notations in DTD because notation is a QName.
	www.kohsuke.org /xmlschema/XMLSchemaDOsAndDONTs.html (1680 words)

	W3C XML Activities
		XML Schema is an XML based alternative to DTD.
		XML Schema has better support for applications, document structure, attributes, and data-typing.
		XML Schema Structures specifies the XML Schema definition language.
	www.w3schools.com /w3c/w3c_schema.asp (334 words)

	XML Schema Tutorial
		XML Schema is an XML-based alternative to DTDs.
		An XML Schema describes the structure of an XML document.
		The XML Schema language is also referred to as XML Schema Definition (XSD).
	www.w3schools.com /schema/default.asp (335 words)

	W3C XML Schema
		There are no official versions of the W3C XML Schema at this time.
		The DocBook Technical Committee is planning to offer an official W3C XML Schema in the DocBook V5.0 time frame.
		In the meantime, these versions are derived from the DTD using Trang.
	www.docbook.org /xsd (58 words)

	xmlhack: W3C collecting XML Schema tests (Site not responding. Last check: 2007-10-12)
		Henry Thompson has announced a W3C XML Schema Test Collection project, to coordinate test suites for W3C XML Schema processors.
		In connection with this last item, Thompson announced that the W3C would shortly be releasing schemas for the XML Infoset and the XML Post Validation Infoset.
		The W3C intends to collect tests from member companies and the public.
	xmlhack.com /read.php?item=1202 (66 words)

	2. W3C XML Schema example
		The W3C XML Schema example is similar to the DTD example.
		If you create a configuration file with a text editor, do not forget to check its validity before deploying it because, for performance reasons, XXE does not thoroughly validates its configuration files at start-up time.
		Options, Schema tab, Enable cache toggle) if you intend to develop your own schema and test it using XXE.
	www.xmlmind.com /xmleditor/_distrib/doc/configure/xsd_example.html (346 words)

	DocBook W3C XML Schema 4.3 (Site not responding. Last check: 2007-10-12)
		DocBook W3C XML Schema 4.3 is available as a zip archive.
		A version of the SGML Open CALS Table model.
		Schema for the attributes in the xml: namespace.
	docbook.org /xsd/4.3 (52 words)

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