5. XML Schema

XML Schema Language

• Developed by World Wide Web Consortium www.w3.org to give users more control on the contents of an XML document
• Written in XML to define a set of data types for specifying XML elements and attributes
• It is a W3C recommended, May 2, 2001, that can found at www.w3.org/XML/Schema
• XML Schema Part 0: Primer, W3C Recommendation, 2 May 2001 that can found at www.w3.org/TR/xmlschema-0

In XML schema, XML document may have two types of contents:

• Simple type (built-in)

string normalizedString token

byte unsignedByte base64Binary

hexBinary integer positiveInteger

negativeInteger nonNegativeInteger nonPositiveInteger int unsignedInt long unsignedLong short unsignedShort decimal float double Boolean time dateTime duration date gMonth

gYear gYearMonth gDay gMonthDay Name Qname NCName anyURI language

ID

IDREF IDERFS ENTITY

ENTITIES NOTATION NMTOKEN

NMTOKENS

• Complex type (element that contain sub-elements or carry attributes)
• elements that contain only text
• elements that are empty
• elements that contain other elements
• elements that contains both elements and text

XML Namespace

• The needs
• Namespace syntax
• Qualified Names, Prefixes, and Local parts
• Binding Prefixes to URIs
• Namespace URIs
• Setting a Default Namespace with the xmlns Attribute
• Attribute Declarations for xmlns

Web Site References

XML Schema http://www.w3.org/XML/Schema

XML Technologies Tutorial Presentations

• XML Schema Part 0 Primer: http://www.w3.org/TR/xmlschema-0/
• XML Schema Tutorial: http://www.xfront.com/
• XML Technologies http://www.xfront.com/
• XML Schema Best Practice Homepage http://www.xfront.com/BestPracticesHomepage.html
• XML Specification in Context: http://www.ascc.net/~ricko/XMLSchemaInContext.html