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## net.sf.saxon.type
Class ExternalObjectType

    java.lang.Object
      net.sf.saxon.type.ExternalObjectType

All Implemented Interfaces:
  Serializable, AtomicType, ItemType, SchemaComponent, SchemaType, SimpleType

    public class ExternalObjectType

extends Object
implements AtomicType, Serializable

This class represents the type of an external Java object returned by an extension function, or supplied as an external variable/parameter.

See Also:
  Serialized Form

Field Summary

Fields inherited from interface net.sf.saxon.type.SimpleType
`VARIETY_ATOMIC, VARIETY_LIST, VARIETY_UNION, VARIETY_UNSPECIFIED_SIMPLE`

Fields inherited from interface net.sf.saxon.type.SchemaType
`DERIVATION_EXTENSION, DERIVATION_LIST, DERIVATION_RESTRICTION, DERIVATION_UNION, DERIVE_BY_SUBSTITUTION`

Fields inherited from interface net.sf.saxon.type.SchemaComponent
`FIXED_UP, INCOMPLETE, INVALID, UNVALIDATED, VALIDATED, VALIDATING`

Constructor Summary
`ExternalObjectType(Class javaClass)` Create an anonymous external object type.
`ExternalObjectType(Class javaClass, Configuration config)` Create an external object type.

Method Summary
`boolean` | `allowsDerivation(int derivation)` Determines whether derivation (of a particular kind) from this type is allowed, based on the "final" property
`void` | `analyzeContentExpression(Expression expression, int kind, StaticContext env)` Analyze an expression to see whether the expression is capable of delivering a value of this type.
`static void` | `analyzeContentExpression(SimpleType simpleType, Expression expression, StaticContext env, int kind)` Analyze an expression to see whether the expression is capable of delivering a value of this type.
`CharSequence` | `applyWhitespaceNormalization(CharSequence value)` Apply the whitespace normalization rules for this simple type
`Value` | `atomize(NodeInfo node)` Get the typed value of a node that is annotated with this schema type.
`void` | `checkTypeDerivationIsOK(SchemaType type, int block)` Check that this type is validly derived from a given type
`boolean` | `equals(Object obj)` Test whether two ExternalObjectType objects represent the same type
`AtomicType` | `getAtomizedItemType()` Get the item type of the atomic values that will be produced when an item of this type is atomized
`SchemaType` | `getBaseType()` Returns the base type that this type inherits from.
`int` | `getBlock()` Returns the value of the 'block' attribute for this type, as a bit-signnificant integer with fields such as `SchemaType.DERIVATION_LIST` and `SchemaType.DERIVATION_EXTENSION`
`SchemaType` | `getBuiltInBaseType()` Returns the built-in base type this type is derived from.
`AtomicType` | `getCommonAtomicType()` Get the most specific possible atomic type that all items in this SimpleType belong to
`int` | `getDerivationMethod()` Gets the integer code of the derivation method used to derive this type from its parent.
`String` | `getDescription()` Get a description of this type for use in error messages.
`String` | `getDisplayName()` Get the display name of the type: that is, a lexical QName with an arbitrary prefix
`int` | `getFingerprint()` Get the fingerprint of the name of this type
`Class` | `getJavaClass()` Get the Java class to which this external object type corresponds
`SchemaType` | `getKnownBaseType()` Returns the base type that this type inherits from.
`String` | `getName()` Get the local name of this type
`int` | `getNameCode()` Get the namecode of the name of this type.
`ItemType` | `getPrimitiveItemType()` Get the primitive item type corresponding to this item type.
`int` | `getPrimitiveType()` Get the primitive type corresponding to this item type.
`int` | `getRedefinitionLevel()` Get the redefinition level.
`int` | `getRelationship(ExternalObjectType other)` Get the relationship of this external object type to another external object type
`ItemType` | `getSuperType(TypeHierarchy th)` Get the type from which this item type is derived by restriction.
`String` | `getSystemId()` Get the URI of the schema document where the type was originally defined.
`String` | `getTargetNamespace()` Get the target namespace of this type
`SequenceIterator` | `getTypedValue(CharSequence value, NamespaceResolver resolver, ConversionRules rules)` Get the typed value corresponding to a given string value, assuming it is valid against this type
`SequenceIterator` | `getTypedValue(NodeInfo node)` Get the typed value of a node that is annotated with this schema type
`StructuredQName` | `getTypeName()` Get the name of this type as a StructuredQName, unless the type is anonymous, in which case return null
`int` | `getValidationStatus()` Get the validation status - always valid
`int` | `getWhitespaceAction()` Determine the whitespace normalization required for values of this type
`int` | `hashCode()` Returns a hash code value for the object.
`boolean` | `isAbstract()` Determine whether the type is abstract, that is, whether it cannot have instances that are not also instances of some concrete subtype
`boolean` | `isAnonymousType()` Test whether this is an anonymous type
`boolean` | `isAtomicType()` Test whether this Simple Type is an atomic type
`boolean` | `isAtomizable()` Ask whether values of this type are atomizable
`boolean` | `isBuiltInType()` Determine whether this is a built-in type or a user-defined type
`boolean` | `isComplexType()` Test whether this SchemaType is a complex type
`boolean` | `isExternalType()` Return true if this is an external object type, that is, a Saxon-defined type for external Java or .NET objects
`boolean` | `isIdRefType()` Ask whether this type is an IDREF or IDREFS type.
`boolean` | `isIdType()` Ask whether this type is an ID type.
`boolean` | `isListType()` Returns true if this type is derived by list, or if it is derived by restriction from a list type, or if it is a union that contains a list as one of its members
`boolean` | `isNamespaceSensitive()` Test whether this simple type is namespace-sensitive, that is, whether it is derived from xs:QName or xs:NOTATION
`boolean` | `isOrdered()` Determine whether the atomic type is ordered, that is, whether less-than and greater-than comparisons are permitted
`boolean` | `isPrimitiveType()` Determine whether the atomic type is a primitive type.
`boolean` | `isSameType(SchemaType other)` Test whether this is the same type as another type.
`boolean` | `isSimpleType()` Returns true if this SchemaType is a SimpleType
`boolean` | `isUnionType()` Return true if this type is a union type (that is, if its variety is union)
`boolean` | `matchesItem(Item item, boolean allowURIPromotion, Configuration config)` Test whether a given item conforms to this type
`CharSequence` | `postprocess(CharSequence input)` Reverse any pre-lexical facets, other than whitespace.
`CharSequence` | `preprocess(CharSequence input)` Apply any pre-lexical facets, other than whitespace.
`String` | `toString()`
`String` | `toString(NamePool pool)` Produce a representation of this type name for use in error messages.
`ValidationFailure` | `validate(AtomicValue primValue, CharSequence lexicalValue, ConversionRules rules)` Validate that a primitive atomic value is a valid instance of a type derived from the same primitive type.
`ValidationFailure` | `validateContent(CharSequence value, NamespaceResolver nsResolver, ConversionRules rules)` Check whether a given input string is valid according to this SimpleType
`void` | `visitNamedSchemaComponents(SchemaComponentVisitor visitor)` Visit all the schema components used in this ItemType definition

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

### ExternalObjectType

    public ExternalObjectType(Class javaClass)

  Create an anonymous external object type. When constructed this way, the type will not have a nameCode or fingerprint in the name pool, so methods asking for the name of the type will return no value.

  Parameters:
    `javaClass` - the Java class to which this type corresponds

### ExternalObjectType

    public ExternalObjectType(Class javaClass,
                              Configuration config)

  Create an external object type. When constructed this way, the type will have a fingerprint in the name pool based on the Java class name

  Parameters:
    `javaClass` - the Java class to which this type corresponds
    `config` - the Saxon configuration

Method Detail

### getName

    public String getName()

  Get the local name of this type

  Specified by:
    `getName` in interface `SchemaType`
  Returns:
    the local name of this type definition, if it has one. Return null in the case of an anonymous type.

### getTargetNamespace

    public String getTargetNamespace()

  Get the target namespace of this type

  Specified by:
    `getTargetNamespace` in interface `SchemaType`
  Returns:
    the target namespace of this type definition, if it has one. Return null in the case of an anonymous type, and in the case of a global type defined in a no-namespace schema.

### isExternalType

    public boolean isExternalType()

  Return true if this is an external object type, that is, a Saxon-defined type for external Java or .NET objects

  Specified by:
    `isExternalType` in interface `SimpleType`
  Returns:
    true if this is an external type

### isBuiltInType

    public boolean isBuiltInType()

  Determine whether this is a built-in type or a user-defined type

  Specified by:
    `isBuiltInType` in interface `AtomicType`
  Specified by:
    `isBuiltInType` in interface `SimpleType`
  Returns:
    false - external types are not built in

### getTypeName

    public StructuredQName getTypeName()

  Get the name of this type as a StructuredQName, unless the type is anonymous, in which case return null

  Specified by:
    `getTypeName` in interface `AtomicType`
  Returns:
    the name of the atomic type, or null if the type is anonymous.

### getRedefinitionLevel

    public int getRedefinitionLevel()

  Get the redefinition level. This is zero for a component that has not been redefined; for a redefinition of a level-0 component, it is 1; for a redefinition of a level-N component, it is N+1. This concept is used to support the notion of "pervasive" redefinition: if a component is redefined at several levels, the top level wins, but it is an error to have two versions of the component at the same redefinition level.

  Specified by:
    `getRedefinitionLevel` in interface `SchemaComponent`
  Returns:
    the redefinition level

### isAbstract

    public boolean isAbstract()

  Determine whether the type is abstract, that is, whether it cannot have instances that are not also instances of some concrete subtype

  Specified by:
    `isAbstract` in interface `AtomicType`
  Returns:
    false - external types are not abstract

### isPrimitiveType

    public boolean isPrimitiveType()

  Determine whether the atomic type is a primitive type. The primitive types are the 19 primitive types of XML Schema, plus xs:integer, xs:dayTimeDuration and xs:yearMonthDuration; xs:untypedAtomic; and all supertypes of these (xs:anyAtomicType, xs:numeric, ...)

  Specified by:
    `isPrimitiveType` in interface `AtomicType`
  Returns:
    true if the type is considered primitive under the above rules

### getCommonAtomicType

    public AtomicType getCommonAtomicType()

  Get the most specific possible atomic type that all items in this SimpleType belong to

  Specified by:
    `getCommonAtomicType` in interface `SimpleType`
  Returns:
    the lowest common supertype of all member types

### isOrdered

    public boolean isOrdered()

  Determine whether the atomic type is ordered, that is, whether less-than and greater-than comparisons are permitted

  Specified by:
    `isOrdered` in interface `AtomicType`
  Returns:
    true if ordering operations are permitted

### getSystemId

    public String getSystemId()

  Get the URI of the schema document where the type was originally defined.

  Specified by:
    `getSystemId` in interface `SchemaType`
  Returns:
    the URI of the schema document. Returns null if the information is unknown or if this is a built-in type

### getValidationStatus

    public final int getValidationStatus()

  Get the validation status - always valid

  Specified by:
    `getValidationStatus` in interface `SchemaComponent`
  Returns:
    one of the values `SchemaComponent.UNVALIDATED`, `SchemaComponent.VALIDATING`, `SchemaComponent.VALIDATED`, `SchemaComponent.INVALID`, `SchemaComponent.INCOMPLETE`

### getBlock

    public final int getBlock()

  Returns the value of the 'block' attribute for this type, as a bit-signnificant integer with fields such as `SchemaType.DERIVATION_LIST` and `SchemaType.DERIVATION_EXTENSION`

  Specified by:
    `getBlock` in interface `SchemaType`
  Returns:
    the value of the 'block' attribute for this type

### getDerivationMethod

    public final int getDerivationMethod()

  Gets the integer code of the derivation method used to derive this type from its parent. Returns zero for primitive types.

  Specified by:
    `getDerivationMethod` in interface `SchemaType`
  Returns:
    a numeric code representing the derivation method, for example `SchemaType.DERIVATION_RESTRICTION`

### allowsDerivation

    public final boolean allowsDerivation(int derivation)

  Determines whether derivation (of a particular kind) from this type is allowed, based on the "final" property

  Specified by:
    `allowsDerivation` in interface `SchemaType`
  Parameters:
    `derivation` - the kind of derivation, for example `SchemaType.DERIVATION_LIST`
  Returns:
    true if this kind of derivation is allowed

### getNameCode

    public int getNameCode()

  Get the namecode of the name of this type. This includes the prefix from the original type declaration: in the case of built-in types, there may be a conventional prefix or there may be no prefix.

  Specified by:
    `getNameCode` in interface `SchemaType`
  Returns:
    the namecode. Returns an invented namecode for an anonymous type.

### isComplexType

    public final boolean isComplexType()

  Test whether this SchemaType is a complex type

  Specified by:
    `isComplexType` in interface `SchemaType`
  Returns:
    true if this SchemaType is a complex type

### getBaseType

    public final SchemaType getBaseType()

  Returns the base type that this type inherits from. This method can be used to get the base type of a type that is known to be valid. If this type is a Simpletype that is a built in primitive type then null is returned.

  Specified by:
    `getBaseType` in interface `SchemaType`
  Returns:
    the base type.
  Throws:
    `IllegalStateException` - if this type is not valid.

### getPrimitiveItemType

    public ItemType getPrimitiveItemType()

  Get the primitive item type corresponding to this item type. For item(), this is Type.ITEM. For node(), it is Type.NODE. For specific node kinds, it is the value representing the node kind, for example Type.ELEMENT. For anyAtomicValue it is Type.ATOMIC_VALUE. For numeric it is Type.NUMBER. For other atomic types it is the primitive type as defined in XML Schema, except that INTEGER is considered to be a primitive type.

  Specified by:
    `getPrimitiveItemType` in interface `ItemType`

### getPrimitiveType

    public int getPrimitiveType()

  Get the primitive type corresponding to this item type. For item(), this is Type.ITEM. For node(), it is Type.NODE. For specific node kinds, it is the value representing the node kind, for example Type.ELEMENT. For anyAtomicValue it is Type.ATOMIC. For numeric it is Type.NUMBER. For other atomic types it is the primitive type as defined in XML Schema, except that INTEGER is considered to be a primitive type.

  Specified by:
    `getPrimitiveType` in interface `ItemType`

### toString

    public String toString(NamePool pool)

  Produce a representation of this type name for use in error messages. Where this is a QName, it will use conventional prefixes

  Specified by:
    `toString` in interface `ItemType`
  Parameters:
    `pool` - the name pool
  Returns:
    a string representation of the type, in notation resembling but not necessarily identical to XPath syntax

### getAtomizedItemType

    public AtomicType getAtomizedItemType()

  Get the item type of the atomic values that will be produced when an item of this type is atomized

  Specified by:
    `getAtomizedItemType` in interface `ItemType`
  Returns:
    the item type of the atomic values that will be produced when an item of this type is atomized

### isAtomizable

    public boolean isAtomizable()

  Ask whether values of this type are atomizable

  Specified by:
    `isAtomizable` in interface `ItemType`
  Returns:
    true unless it is known that these items will be elements with element-only content, in which case return false

### getKnownBaseType

    public SchemaType getKnownBaseType()

  Returns the base type that this type inherits from. This method can be used to get the base type of a type that is known to be valid. If this type is a Simpletype that is a built in primitive type then null is returned.

  Returns:
    the base type.
  Throws:
    `IllegalStateException` - if this type is not valid.

### isSameType

    public boolean isSameType(SchemaType other)

  Test whether this is the same type as another type. They are considered to be the same type if they are derived from the same type definition in the original XML representation (which can happen when there are multiple includes of the same file)

  Specified by:
    `isSameType` in interface `SchemaType`
  Parameters:
    `other` - the other type
  Returns:
    true if this is the same type as other

### getRelationship

    public int getRelationship(ExternalObjectType other)

  Get the relationship of this external object type to another external object type

  Parameters:
    `other` - the other external object type
  Returns:
    the relationship of this external object type to another external object type, as one of the constants in class `TypeHierarchy`, for example `TypeHierarchy.SUBSUMES`

### getDescription

    public String getDescription()

  Description copied from interface: `SchemaType`
  Get a description of this type for use in error messages. This is the same as the display name in the case of named types; for anonymous types it identifies the type by its position in a source schema document.

  Specified by:
    `getDescription` in interface `SchemaType`
  Returns:
    text identifing the type, for use in a phrase such as "the type XXXX".

### checkTypeDerivationIsOK

    public void checkTypeDerivationIsOK(SchemaType type,
                                        int block)
                                 throws SchemaException

  Check that this type is validly derived from a given type

  Specified by:
    `checkTypeDerivationIsOK` in interface `SchemaType`
  Parameters:
    `type` - the type from which this type is derived
    `block` - the derivations that are blocked by the relevant element declaration
  Throws:
    `SchemaException` - if the derivation is not allowed

### isSimpleType

    public final boolean isSimpleType()

  Returns true if this SchemaType is a SimpleType

  Specified by:
    `isSimpleType` in interface `SchemaType`
  Returns:
    true (always)

### isAtomicType

    public boolean isAtomicType()

  Test whether this Simple Type is an atomic type

  Specified by:
    `isAtomicType` in interface `ItemType`
  Specified by:
    `isAtomicType` in interface `SchemaType`
  Specified by:
    `isAtomicType` in interface `SimpleType`
  Returns:
    true, this is considered to be an atomic type

### isIdType

    public boolean isIdType()

  Ask whether this type is an ID type. This is defined to be any simple type who typed value may contain atomic values of type xs:ID: that is, it includes types derived from ID by restriction, list, or union. Note that for a node to be treated as an ID, its typed value must be a *single* atomic value of type ID; the type of the node, however, can still allow a list.

  Specified by:
    `isIdType` in interface `SchemaType`

### isIdRefType

    public boolean isIdRefType()

  Ask whether this type is an IDREF or IDREFS type. This is defined to be any simple type who typed value may contain atomic values of type xs:IDREF: that is, it includes types derived from IDREF or IDREFS by restriction, list, or union

  Specified by:
    `isIdRefType` in interface `SchemaType`

### isListType

    public boolean isListType()

  Returns true if this type is derived by list, or if it is derived by restriction from a list type, or if it is a union that contains a list as one of its members

  Specified by:
    `isListType` in interface `SimpleType`
  Returns:
    true if this is a list type

### isUnionType

    public boolean isUnionType()

  Return true if this type is a union type (that is, if its variety is union)

  Specified by:
    `isUnionType` in interface `SimpleType`
  Returns:
    true for a union type

### getWhitespaceAction

    public int getWhitespaceAction()

  Determine the whitespace normalization required for values of this type

  Specified by:
    `getWhitespaceAction` in interface `SimpleType`
  Returns:
    one of PRESERVE, REPLACE, COLLAPSE

### applyWhitespaceNormalization

    public CharSequence applyWhitespaceNormalization(CharSequence value)
                                              throws ValidationException

  Apply the whitespace normalization rules for this simple type

  Parameters:
    `value` - the string before whitespace normalization
  Returns:
    the string after whitespace normalization
  Throws:
    `ValidationException`

### getBuiltInBaseType

    public SchemaType getBuiltInBaseType()

  Returns the built-in base type this type is derived from.

  Specified by:
    `getBuiltInBaseType` in interface `SimpleType`
  Returns:
    the first built-in type found when searching up the type hierarchy

### isNamespaceSensitive

    public boolean isNamespaceSensitive()

  Test whether this simple type is namespace-sensitive, that is, whether it is derived from xs:QName or xs:NOTATION

  Specified by:
    `isNamespaceSensitive` in interface `SimpleType`
  Returns:
    true if this type is derived from xs:QName or xs:NOTATION

### isAnonymousType

    public boolean isAnonymousType()

  Test whether this is an anonymous type

  Specified by:
    `isAnonymousType` in interface `SchemaType`
  Returns:
    true if this SchemaType is an anonymous type

### getTypedValue

    public final SequenceIterator getTypedValue(NodeInfo node)

  Get the typed value of a node that is annotated with this schema type

  Specified by:
    `getTypedValue` in interface `SchemaType`
  Parameters:
    `node` - the node whose typed value is required
  Returns:
    an iterator over the items making up the typed value of this node. The objects returned by this SequenceIterator will all be of type `AtomicValue`

### atomize

    public Value atomize(NodeInfo node)
                  throws XPathException

  Get the typed value of a node that is annotated with this schema type. The result of this method will always be consistent with the method `getTypedValue(net.sf.saxon.om.NodeInfo)`. However, this method is often more convenient and may be more efficient, especially in the common case where the value is expected to be a singleton.

  Specified by:
    `atomize` in interface `SchemaType`
  Parameters:
    `node` - the node whose typed value is required
  Returns:
    the typed value.
  Throws:
    `XPathException`
  Since:
    8.5

### getTypedValue

    public SequenceIterator getTypedValue(CharSequence value,
                                          NamespaceResolver resolver,
                                          ConversionRules rules)
                                   throws ValidationException

  Get the typed value corresponding to a given string value, assuming it is valid against this type

  Specified by:
    `getTypedValue` in interface `SimpleType`
  Parameters:
    `value` - the string value
    `resolver` - a namespace resolver used to resolve any namespace prefixes appearing in the content of values. Can supply null, in which case any namespace-sensitive content will be rejected.
    `rules` -
  Returns:
    an iterator over the atomic sequence comprising the typed value. The objects returned by this SequenceIterator will all be of type `AtomicValue`
  Throws:
    `ValidationException` - if the supplied value is not in the lexical space of the data type

### validate

    public ValidationFailure validate(AtomicValue primValue,
                                      CharSequence lexicalValue,
                                      ConversionRules rules)

  Validate that a primitive atomic value is a valid instance of a type derived from the same primitive type.

  Specified by:
    `validate` in interface `AtomicType`
  Parameters:
    `primValue` - the value in the value space of the primitive type.
    `lexicalValue` - the value in the lexical space. If null, the string value of primValue is used. This value is checked against the pattern facet (if any)
    `rules` -
  Returns:
    null if the value is valid; otherwise, a ValidationFailure object indicating the nature of the error.
  Throws:
    `UnsupportedOperationException` - in the case of an external object type

### analyzeContentExpression

    public void analyzeContentExpression(Expression expression,
                                         int kind,
                                         StaticContext env)
                                  throws XPathException

  Analyze an expression to see whether the expression is capable of delivering a value of this type.

  Specified by:
    `analyzeContentExpression` in interface `SchemaType`
  Parameters:
    `expression` - the expression that delivers the content
    `kind` - the node kind whose content is being delivered: `Type.ELEMENT`, `Type.ATTRIBUTE`, or `Type.DOCUMENT`
    `env` - the static evaluation context
  Throws:
    `XPathException` - if the expression will never deliver a value of the correct type

### analyzeContentExpression

    public static void analyzeContentExpression(SimpleType simpleType,
                                                Expression expression,
                                                StaticContext env,
                                                int kind)
                                         throws XPathException

  Analyze an expression to see whether the expression is capable of delivering a value of this type.

  Parameters:
    `simpleType` - the simple type against which the expression is to be checked
    `expression` - the expression that delivers the content
    `env` - the static evaluation context
    `kind` - the node kind whose content is being delivered: `Type.ELEMENT`, `Type.ATTRIBUTE`, or `Type.DOCUMENT`
  Throws:
    `XPathException` - if the expression will never deliver a value of the correct type

### getJavaClass

    public Class getJavaClass()

  Get the Java class to which this external object type corresponds

  Returns:
    the corresponding Java class

### matchesItem

    public boolean matchesItem(Item item,
                               boolean allowURIPromotion,
                               Configuration config)

  Test whether a given item conforms to this type

  Specified by:
    `matchesItem` in interface `ItemType`
  Parameters:
    `item` - The item to be tested
    `allowURIPromotion` -
    `config` -
  Returns:
    true if the item is an instance of this type; false otherwise

### validateContent

    public ValidationFailure validateContent(CharSequence value,
                                             NamespaceResolver nsResolver,
                                             ConversionRules rules)

  Check whether a given input string is valid according to this SimpleType

  Specified by:
    `validateContent` in interface `SimpleType`
  Parameters:
    `value` - the input string to be checked
    `nsResolver` - a namespace resolver used to resolve namespace prefixes if the type is namespace sensitive. The value supplied may be null; in this case any namespace-sensitive content will throw an UnsupportedOperationException.
    `rules` -
  Returns:
    null if validation succeeds; return a ValidationException describing the validation failure if validation fails, unless throwException is true, in which case the exception is thrown rather than being returned.
  Throws:
    `UnsupportedOperationException` - if the type is namespace-sensitive and no namespace resolver is supplied

### getSuperType

    public ItemType getSuperType(TypeHierarchy th)

  Description copied from interface: `ItemType`
  Get the type from which this item type is derived by restriction. This is the supertype in the XPath type heirarchy, as distinct from the Schema base type: this means that the supertype of xs:boolean is xs:anyAtomicType, whose supertype is item() (rather than xs:anySimpleType).

  In fact the concept of "supertype" is not really well-defined, because the types form a lattice rather than a hierarchy. The only real requirement on this function is that it returns a type that strictly subsumes this type, ideally as narrowly as possible.

  Specified by:
    `getSuperType` in interface `ItemType`
  Parameters:
    `th` - the type hierarchy cache
  Returns:
    the supertype, or null if this type is item()

### getFingerprint

    public int getFingerprint()

  Description copied from interface: `SchemaType`
  Get the fingerprint of the name of this type

  Specified by:
    `getFingerprint` in interface `SchemaType`
  Returns:
    the fingerprint. Returns an invented fingerprint for an anonymous type.

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

### getDisplayName

    public String getDisplayName()

  Description copied from interface: `SchemaType`
  Get the display name of the type: that is, a lexical QName with an arbitrary prefix

  Specified by:
    `getDisplayName` in interface `SchemaType`
  Returns:
    a lexical QName identifying the type

### hashCode

    public int hashCode()

  Returns a hash code value for the object.

  Overrides:
    `hashCode` in class `Object`

### equals

    public boolean equals(Object obj)

  Test whether two ExternalObjectType objects represent the same type

  Overrides:
    `equals` in class `Object`
  Parameters:
    `obj` - the other ExternalObjectType
  Returns:
    true if the two objects represent the same type

### preprocess

    public CharSequence preprocess(CharSequence input)

  Apply any pre-lexical facets, other than whitespace. At the moment the only such facet is saxon:preprocess

  Specified by:
    `preprocess` in interface `SimpleType`
  Parameters:
    `input` - the value to be preprocessed
  Returns:
    the value after preprocessing

### postprocess

    public CharSequence postprocess(CharSequence input)
                             throws ValidationException

  Reverse any pre-lexical facets, other than whitespace. At the moment the only such facet is saxon:preprocess. This is called when converting a value of this type to a string

  Specified by:
    `postprocess` in interface `SimpleType`
  Parameters:
    `input` - the value to be postprocessed: this is the "ordinary" result of converting the value to a string
  Returns:
    the value after postprocessing
  Throws:
    `ValidationException`

### visitNamedSchemaComponents

    public void visitNamedSchemaComponents(SchemaComponentVisitor visitor)
                                    throws XPathException

  Visit all the schema components used in this ItemType definition

  Specified by:
    `visitNamedSchemaComponents` in interface `ItemType`
  Parameters:
    `visitor` - the visitor class to be called when each component is visited
  Throws:
    `XPathException`

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