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## net.sf.saxon.type
Interface SchemaType

All Superinterfaces:
  SchemaComponent

All Known Subinterfaces:
  AtomicType, ComplexType, ListType, SimpleType

All Known Implementing Classes:
  AnySimpleType, AnyType, BuiltInAtomicType, BuiltInListType, ExternalObjectType, Untyped

public interface SchemaType
extends SchemaComponent

SchemaType is an interface implemented by all schema types: simple and complex types, built-in and user-defined types.

There is a hierarchy of interfaces that extend SchemaType, representing the top levels of the schema type system: SimpleType and ComplexType, with SimpleType further subdivided into List, Union, and Atomic types.

The implementations of these interfaces are organized into a different hierarchy: on the one side, built-in types such as AnyType, AnySimpleType, and the built-in atomic types and list types; on the other side, user-defined types defined in a schema.

Field Summary
`static int` | `DERIVATION_EXTENSION` If the document's schema is an XML Schema [XML Schema Part 1] , this constant represents the derivation by extension.
`static int` | `DERIVATION_LIST` If the document's schema is an XML Schema [XML Schema Part 1] , this constant represents the list.
`static int` | `DERIVATION_RESTRICTION` If the document's schema is an XML Schema [XML Schema Part 1] , this constant represents the derivation by restriction if complex types are involved, or a restriction if simple types are involved.
`static int` | `DERIVATION_UNION` If the document's schema is an XML Schema [XML Schema Part 1] , this constant represents the union if simple types are involved.
`static int` | `DERIVE_BY_SUBSTITUTION` Derivation by substitution.

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

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.
`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 `DERIVATION_LIST` and `DERIVATION_EXTENSION`
`int` | `getDerivationMethod()` Gets the integer code of the derivation method used to derive this type from its parent.
`java.lang.String` | `getDescription()` Get a description of this type for use in error messages.
`java.lang.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
`int` | `getNameCode()` Get the namecode of the name of this type.
`SequenceIterator` | `getTypedValue(NodeInfo node)` Get the typed value of a node that is annotated with this schema type.
`boolean` | `isComplexType()` Test whether this SchemaType is a complex type
`boolean` | `isSameType(SchemaType other)` Test whether this is the same type as another type.
`boolean` | `isSimpleType()` Test whether this SchemaType is a simple type
`void` | `isTypeDerivationOK(SchemaType base, int block)` Check that this type is validly derived from a given type, following the rules for the Schema Component Constraint "Is Type Derivation OK (Simple)" (3.14.6) or "Is Type Derivation OK (Complex)" (3.4.6) as appropriate.

Methods inherited from interface net.sf.saxon.type.SchemaComponent
`getValidationStatus`

Field Detail

### DERIVATION_RESTRICTION

    public static final int DERIVATION_RESTRICTION

  If the document's schema is an XML Schema [XML Schema Part 1] , this constant represents the derivation by restriction if complex types are involved, or a restriction if simple types are involved.
  The reference type definition is derived by restriction from the other type definition if the other type definition is the same as the reference type definition, or if the other type definition can be reached recursively following the {base type definition} property from the reference type definition, and all the derivation methods involved are restriction.

  See Also:
    Constant Field Values

### DERIVATION_EXTENSION

    public static final int DERIVATION_EXTENSION

  If the document's schema is an XML Schema [XML Schema Part 1] , this constant represents the derivation by extension.
  The reference type definition is derived by extension from the other type definition if the other type definition can be reached recursively following the {base type definition} property from the reference type definition, and at least one of the derivation methods involved is an extension.

  See Also:
    Constant Field Values

### DERIVATION_UNION

    public static final int DERIVATION_UNION

  If the document's schema is an XML Schema [XML Schema Part 1] , this constant represents the union if simple types are involved.
  The reference type definition is derived by union from the other type definition if there exists two type definitions T1 and T2 such as the reference type definition is derived from T1 by `DERIVATION_RESTRICTION` or `DERIVATION_EXTENSION`, T2 is derived from the other type definition by `DERIVATION_RESTRICTION`, T1 has {variety} union, and one of the {member type definitions} is T2. Note that T1 could be the same as the reference type definition, and T2 could be the same as the other type definition.

  See Also:
    Constant Field Values

### DERIVATION_LIST

    public static final int DERIVATION_LIST

  If the document's schema is an XML Schema [XML Schema Part 1] , this constant represents the list.
  The reference type definition is derived by list from the other type definition if there exists two type definitions T1 and T2 such as the reference type definition is derived from T1 by `DERIVATION_RESTRICTION` or `DERIVATION_EXTENSION`, T2 is derived from the other type definition by `DERIVATION_RESTRICTION`, T1 has {variety} list, and T2 is the {item type definition}. Note that T1 could be the same as the reference type definition, and T2 could be the same as the other type definition.

  See Also:
    Constant Field Values

### DERIVE_BY_SUBSTITUTION

    public static final int DERIVE_BY_SUBSTITUTION

  Derivation by substitution. This constant, unlike the others, is NOT defined in the DOM level 3 TypeInfo interface.

  See Also:
    Constant Field Values

Method Detail

### 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.

### getFingerprint

    public int getFingerprint()

  Get the fingerprint of the name of this type

  Returns:
    the fingerprint. Returns an invented fingerprint for an anonymous type.

### getDisplayName

    public java.lang.String getDisplayName()

  Get the display name of the type: that is, a lexical QName with an arbitrary prefix

  Returns:
    a lexical QName identifying the type

### isComplexType

    public boolean isComplexType()

  Test whether this SchemaType is a complex type

  Returns:
    true if this SchemaType is a complex type

### isSimpleType

    public boolean isSimpleType()

  Test whether this SchemaType is a simple type

  Returns:
    true if this SchemaType is a simple type

### getBlock

    public int getBlock()

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

  Returns:
    the value of the 'block' attribute for this type

### getBaseType

    public SchemaType getBaseType()
                           throws UnresolvedReferenceException

  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:
    `java.lang.IllegalStateException` - if this type is not valid.
    `UnresolvedReferenceException`

### getDerivationMethod

    public int getDerivationMethod()

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

  Returns:
    a numeric code representing the derivation method, for example `DERIVATION_RESTRICTION`

### allowsDerivation

    public boolean allowsDerivation(int derivation)

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

  Parameters:
    `derivation` - the kind of derivation, for example `DERIVATION_LIST`
  Returns:
    true if this kind of derivation is allowed

### 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.

  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 for the query or stylesheet
  Throws:
    `XPathException` - if the expression will never deliver a value of the correct type

### getTypedValue

    public SequenceIterator getTypedValue(NodeInfo node)
                                   throws XPathException

  Get the typed value of a node that is annotated with this schema type. This method must be called only for a valid type.

  Parameters:
    `node` - the node whose typed value is required
  Returns:
    a SequenceIterator over the atomic values making up the typed value of the specified node. The objects returned by this iterator are of type `AtomicValue`
  Throws:
    `XPathException`

### 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)

### getDescription

    public java.lang.String getDescription()

  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.

  Returns:
    text identifing the type, for use in a phrase such as "the type XXXX".

### isTypeDerivationOK

    public void isTypeDerivationOK(SchemaType base,
                                   int block)
                            throws SchemaException,
                                   ValidationException

  Check that this type is validly derived from a given type, following the rules for the Schema Component Constraint "Is Type Derivation OK (Simple)" (3.14.6) or "Is Type Derivation OK (Complex)" (3.4.6) as appropriate.

  Parameters:
    `base` - the base type; the algorithm tests whether derivation from this type is permitted
    `block` - the derivations that are blocked by the relevant element declaration
  Throws:
    `SchemaException` - if the derivation is not allowed
    `ValidationException`

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