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These components are usually created by processing a collection of schema documents, which contain the source language definitions of these components.In popular usage, however, a schema document is often referred to as a schema.In its appendix of references, the XSD specification acknowledges the influence of DTDs and other early XML schema efforts such as DDML, SOX, XML-Data, and XDR.It has adopted features from each of these proposals but is also a compromise among them.In XSD 1.1, a complex type may be constrained by assertions — XPath 2.0 expressions evaluated against the content that must evaluate to true.
Varieties of content model include: A complex type can be derived from another complex type by restriction (disallowing some elements, attributes, or values that the base type permits) or by extension (allowing additional attributes and elements to appear).They can check if it adheres to the description of the element it is placed in.Like all XML schema languages, XSD can be used to express a set of rules to which an XML document must conform in order to be considered "valid" according to that schema.However, unlike most other schema languages, XSD was also designed with the intent that determination of a document's validity would produce a collection of information adhering to specific data types.Such a post-validation infoset can be useful in the development of XML document processing software. It was the first separate schema language for XML to achieve Recommendation status by the W3C.
The XML Schema data model includes: This collection of information is called the Post-Schema-Validation Infoset (PSVI).