TupleType (saxon JavaDoc)

All Superinterfaces:

FunctionItemType, ItemType

All Known Implementing Classes:

TupleItemType
```
public interface TupleType
extends FunctionItemType
```
An instance of this class represents a specific tuple item type, for example tuple(x: xs:double, y: element(employee)). Tuple types are a Saxon extension introduced in Saxon 9.8. The syntax for constructing a tuple type requires Saxon-PE or higher, but the supporting code is included in Saxon-HE for convenience.

Nested Class Summary
- Nested classes/interfaces inherited from interface net.sf.saxon.type.ItemType
  ItemType.WithSequenceTypeCache

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Iterable<String>`	`getFieldNames()`	Get the names of all the fields
`SequenceType`	`getFieldType(String field)`	Get the type of a given field
`boolean`	`isExtensible()`	Ask whether the tuple type is extensible, that is, whether fields other than those named are permitted
`boolean`	`isOptional(String field)`	Ask whether a particular field is optional (that is, allowed to be absent from the map)

Methods inherited from interface net.sf.saxon.type.FunctionItemType
getAnnotationAssertions, getArgumentTypes, getGenre, getResultType, isArrayType, isMapType, makeFunctionSequenceCoercer, relationship

Methods inherited from interface net.sf.saxon.type.ItemType
explainMismatch, generateJavaScriptItemTypeAcceptor, generateJavaScriptItemTypeTest, getAlphaCode, getAtomizedItemType, getPrimitiveItemType, getPrimitiveType, getUType, isAtomicType, isAtomizable, isPlainType, isTrueItemType, matches, toExportString, toString

- Method Detail
  - getFieldNames
```
Iterable<String> getFieldNames()
```
    Get the names of all the fields
    
    Returns:
    
    the names of the fields (in arbitrary order)
  - getFieldType
```
SequenceType getFieldType(String field)
```
    Get the type of a given field
    
    Parameters:
    
    field - the name of the field
    
    Returns:
    
    the type of the field if it is defined, or null otherwise
  - isOptional
```
boolean isOptional(String field)
```
    Ask whether a particular field is optional (that is, allowed to be absent from the map)
    
    Parameters:
    
    field - the name of the field
    
    Returns:
    
    true if the field is optional
  - isExtensible
```
boolean isExtensible()
```
    Ask whether the tuple type is extensible, that is, whether fields other than those named are permitted
    
    Returns:
    
    true if fields other than the named fields are permitted to appear