The XML Schema Infoset Model is a library for use with any code that examines, creates, or modifies XML Schemas. These XML Schemas can be stand-alone schemas or part of other artifacts, such as XForms or WSDL documents. The library provides an API for manipulating the components of an XML Schema as described by the W3C XML Schema specifications, as well as an API for manipulating the DOM-accessible representation of XML Schema as a series of XML documents, and for keeping these representations in agreement as schemas are modified.

This library includes APIs to serialize and deserialize XML Schema documents, and to do integrity checking of XML Schemas. This integrity checking looks for things like element references that reference non-existent global elements invalid maximum values.