XML Schema Processing

Classes
class	QPatternist::ComparisonFactory
	Provides compare(), which is a high-level helper function for comparing atomic values. More...
class	QPatternist::NamespaceSupport
	A helper class for handling nested namespace declarations. More...
class	QPatternist::ValueFactory
	Provides fromLexical(), which allows instantiation of atomic values from arbitrary types. More...
class	QPatternist::XsdAlternative
	Represents a XSD alternative object. More...
class	QPatternist::XsdAnnotated
	Base class for all XSD components with annotation content. More...
class	QPatternist::XsdAnnotation
	Represents a XSD annotation object. More...
class	QPatternist::XsdApplicationInformation
	Represents a XSD appinfo object. More...
class	QPatternist::XsdAssertion
	Represents a XSD assertion object. More...
class	QPatternist::XsdAttribute
	Represents a XSD attribute object. More...
class	QPatternist::XsdAttributeGroup
	Represents the XSD attributeGroup object. More...
class	QPatternist::XsdAttributeReference
	A helper class for attribute reference resolving. More...
class	QPatternist::XsdAttributeTerm
	A base class for all attribute types. More...
class	QPatternist::XsdAttributeUse
	Represents a XSD attribute use object. More...
class	QPatternist::XsdComplexType
	Represents a XSD complexType object. More...
class	QPatternist::XsdDocumentation
	Represents a XSD documentation object. More...
class	QPatternist::XsdElement
	Represents a XSD element object. More...
class	QPatternist::XsdFacet
	Represents a XSD facet object. More...
class	QPatternist::XsdIdCache
	Helper class for keeping track of all existing IDs in a schema. More...
class	QPatternist::XsdIdentityConstraint
	Represents a XSD identity constraint object. More...
class	QPatternist::XsdInstanceReader
	The schema instance reader. More...
class	QPatternist::XsdModelGroup
	Represents a XSD model group object. More...
class	QPatternist::XsdNotation
	Represents a XSD notation object, which should not be confused with the atomic type xs:NOTATION. More...
class	QPatternist::XsdParticle
	Represents a XSD particle object. More...
class	QPatternist::XsdParticleChecker
	A helper class to check validity of particles. More...
class	QPatternist::XsdReference
	A helper class for element and group reference resolving. More...
class	QPatternist::XsdSchema
	Represents a XSD schema object. More...
class	QPatternist::XsdSchemaChecker
	Encapsulates the checking of schema valitity after reference resolving has finished. More...
class	QPatternist::XsdSchemaContext
	A context for schema parsing and validation. More...
class	QPatternist::XsdSchemaHelper
	Contains helper methods that are used by XsdSchemaParser, XsdSchemaResolver and XsdSchemaChecker. More...
class	QPatternist::XsdSchemaMerger
	A helper class that merges two schemas into one. More...
class	QPatternist::XsdSchemaParser
	Implements the parsing of XML schema file. More...
class	QPatternist::XsdSchemaParserContext
	A context for schema parsing. More...
class	QPatternist::XsdSchemaResolver
	Encapsulates the resolving of type/element references in a schema after parsing has finished. More...
class	QPatternist::XsdSimpleType
	Represents a XSD simpleType object. More...
class	QPatternist::XsdStateMachine< TransitionType >
	A state machine used for evaluation. More...
class	QPatternist::XsdStateMachineBuilder
	A helper class to build up validation state machines. More...
class	QPatternist::XsdTerm
	A base class for all particles of a model group. More...
class	QPatternist::XsdUserSchemaType< TSuperClass >
	A base class for all user defined simple and complex types. More...
class	QPatternist::XsdValidatedXmlNodeModel
	A delegate class that wraps around a QAbstractXmlNodeModel and provides additional validation specific information. More...
class	QPatternist::XsdValidatingInstanceReader
	The validating schema instance reader. More...
class	QPatternist::XsdWildcard
	Represents a XSD wildcard object. More...
class	QPatternist::XsdXPathExpression
	Represents a XSD assertion object. More...

Detailed Description

Overview

Structure and Components

The schema validator code consists of 4 major components

The schema parser (QPatternist::XsdSchemaParser)

This component parses a XML document that is supplied via a QIODevice. It creates a so called (incomplete) 'compiled schema', which is a representation of the XML Schema structure as C++ objects. As the parser is a streaming parser, it can't resolve references to types or elements/attributes in place, therefor it creates resolver tasks which are passed to the schema resolver component for resolving at a later point in time. The parser does furthermore the basic XML structure constraint checking, e.g. if all required attributes are available or the order of the elements is correct.

The schema resolver (QPatternist::XsdSchemaResolver)

This component is activated after the schema parser component has been finished the parsing of all schemas. The resolver has been supplied with resolve tasks by the schema parser that it will resolve in this step now. Between working on the single resolver tasks, the resolver calls check methods from the schema checker component to make sure that some assertions are valid (e.g. no circular inheritance of types), so that the resolver can work without hassle. During resoving references to attribute or element groups it also checks for circular references of these groups. At the end of that phase we have a compiled schema that is fully resolved (not necessarily valid though).

The schema checker (QPatternist::XsdSchemaChecker)

This component does all the schema constraint checking as given by the Schema specification. At the end of that phase we have fully resolved and valid compiled schema that can be used for validation of instance documents.

The validator (QPatternist::XsdValidatingInstanceReader)

This component is responsible for validating a XML instance document, provided via a QIODevice, against a valid compiled schema.