Package com.saxonica.ee.schema

package com.saxonica.ee.schema

This package contains classes used to represent the information in a schema, that is, the schema components. The model is closely related to the schema component model defined in the XSD specifications, but not identical in every respect. The actual use of a schema for validating instance documents is in package com.saxonica.ee.validate.

Representing the schema itself is the class PreparedSchema. All the schemas that have been imported into the application are linked from the Configuration object; they thus outlive a single transformation or query. Other important classes have intuitive names, for example ComplexType, SimpleType, ElementDecl, and AttributeDecl.

Schema components in Saxon are always built from schema documents, so the classes representing objects in the schema are constructed using the corresponding classes in the com.saxonica.ee.schema.sdoc package. (There is an exception to this: schema components can also be exported to an SCM file, and subsequently re-imported from this file.)

The schema class obtained by the Configuration.getSuperSchema() method represents the collection of all loaded schemas. There can only be one active collection of schema components for any one namespace. This means it is not possible to use two unrelated no-namespace schemas concurrently, or two different versions of a schema for the same namespace.

Named types, element declarations, and attribute declarations are indexed directly from the NamePool. It is not necessary first to locate the schema in which they are contained, they can be found directly using the namePool fingerprint of their expanded QName.

The schema model retains nearly all the information in the source schema: the notable omission is annotations.

The API for this package is particular to Saxon, though it is influenced by the definition of schema components in the XSD specification. At some time in the future it is possible that it may be replaced by an API conforming to externally-defined standards.

Related Packages

Package	Description
com.saxonica.ee.schema.fsa	The package com.saxonica.ee.schema.fsa contains classes used to implement the finite state machines used when validating document instances against a schema.
com.saxonica.ee.schema.sdoc	Internal classes supporting the XDM tree representation of an XSD schema document.

Class	Description
AllModelGroup	An AllModelGroup represents an xs:all element in the schema
Assertion	An Assertion schema component (See XML Schema 1.1 Part 1)
AssertionFacet	Represents an assertion facet on a schema-defined simple type.
AttributeDecl	An XML Schema Attribute Declaration.
AttributeGroupDecl	An XML Schema Attribute Group Declaration.
AttributeGroupReference	An XML Schema Attribute Group Reference, corresponding to an xs:attributeGroup element with a 'ref' attribute.
AttributeUse	An XML Schema Attribute Use: that is, a reference to an attribute declaration from within a complex type or attribute group.
AttributeWildcard	This class represents an xs:anyAttribute element in the schema.
ChoiceModelGroup	A ChoiceCompositor represents an xs:choice element in the schema
ComponentReference	A reference to a schema component.
ComponentWithValueConstraint	Interface for Element Declaration, Attribute Declaration and Attribute Use, created because they share common functionality for handling fixed and default values
ContentType	Corresponds to a Content Type Property Record as defined in the XML Schema 1.1 specification
DigitsFacet	Represents either of the facets totalDigits or fractionDigits
DistinctFacet	The saxon:distinct facet on a list type can be used to constrain the list to contain distinct values.
ElementDecl	The object represents an element declaration in the schema.
ElementParticle	A reference to an element declaration within the content model of a complex type.
ElementWildcard	This class represents an <any> element in the schema.
EnumerationFacet	Represents a single enumeration facet defined on a simple type.
EnumerationFacetSet	Represents the set of enumeration values defined on a single simple type, This is a "virtual" facet that combines all the enumeration facets in one simple type definition.
ExplicitTimezoneFacet	Represents an explicitTimezone facet on a schema-defined simple type derived from date, time, dateTime, gYear, gYearMonth, gMonth, gMonthDay, or gDay
Facet	Represents an XML Schema Facet.
FieldOrSelector	The selector of an IdentityConstraint
FractionDigitsFacet	Represents the fraction-digits facet in a simple type restriction
IdentityConstraint	The base class for the XML Schema Identity Constraints (key, keyref, unique).
IdentityConstraintReference	A reference to an identity constraint
IdentityField	The field selector for an IdentityConstraint
IdentitySelector	The selector of an IdentityConstraint
Key	A class that represents the XML Schema Identity Constraint: Key.
KeyRef	This class represents an xs:keyRef identity constraint in a schema
LengthFacet	Represents the length facet
LengthRangeFacet	Abstract class for the three facets length, minLength, and maxLength.
MaxExclusiveFacet	Implements the maxExclusive facet on a simple type
MaxInclusiveFacet	Implements the maxInclusive facet on a simple type
MaxLengthFacet	Represents the minLength facet
MinExclusiveFacet	Implements the minExclusive facet on a simple type
MinInclusiveFacet	Implements the minInclusive facet on a simple type
MinLengthFacet	Represents the minLength facet
MissingComponentExceptionImpl	This exception occurs when an attempt is made to dereference a reference from one schema component to another, if the target of the reference cannot be found.
ModelGroup	An XML Schema Model Group.
ModelGroupDefinition	A Model Group Definition: a schema component corresponding to a top-level (named) xs:group element in a schema document.
ModelGroupParticle	A reference within the content model of a complex type to a Model Group Definition.
Notation	A Notation Declaration Schema Component
Optionality
OrderFacet	The saxon:order facet on a list type can be used to constrain the list to be in ascending or descending order.
Particle	Represents a Particle as defined by XML Schema.
PatternFacet	Represents a pattern facet on a schema-defined simple type
PreparedSchema	A schema is a collection of schema components.
PreprocessFacet	Represents the preprocess facet on a schema-defined simple type.
SchemaCompiler	A SchemaCompiler is capable of reading source schema documents and converting them into collections of schema components.
SchemaModelLoader	This class allows a compiled schema model in SCM format to be loaded into memory.
SchemaModelSerializer	This class provides services enabling a compiled schema to be serialized to disk
SchemaStructure	The base class for all XML Schema stuctures.
SequenceModelGroup	A SequenceCompositor represents an xs:sequence element in the schema
SerializableSchemaComponent	A component that can be serialized by the SchemaSerializer.
SimpleComponentReference	A reference to a named schema group within the content model of a complex type
SingleNamespaceSchema	A schema (collection of schema components) that has an identifiable target namespace: typically the set of components derived from a single import or include.
SymbolSpace	This class holds constants used to identify the various symbol spaces defined in XML Schema: element declarations, attribute declarations, types, groups, and so on.
Term	Represents a Term in a content model as defined by XML Schema.
TotalDigitsFacet	Eepresents the value of the totalDigits facet
TypeAlternative	A TypeAlternative schema component (See XML Schema 1.1 Part 1 Working Draft)
TypeReference	A reference to a simple or complex type
Unique	This class represents an xs:unique identity constraint
UserAtomicType	An object belonging to this class represents an atomic type: either a built-in atomic type, or a user-defined atomic type.
UserComplexType	A user-defined complex type (that is, any complex type other than xs:anyType)
UserDefinedType	This class represents a user-defined simple type or complex type as defined in XML Schema.
UserListType	Represents a SimpleType that is a list of a given SimpleType, known as its itemType.
UserSchemaComponent	A SchemaComponent is an object in a schema.
UserSimpleType	This class represents a used-defined simple type, as defined in the XML Schema specification.
UserUnionType	A class that represents the XML Schema simple-type with variety union.
ValueConstraint	A value constraint represents the default or fixed value of an element declaration, attribute declaration, or attribute use
ValueConstraint.Variety
ValueRangeFacet	Represents any of the facets minInclusive, maxInclusive, minExclusive, maxExclusive
WhitespaceFacet	Represents a whitespace facet on a schema-defined simple type
Wildcard	A class that represents an XML Schema Wildcard.