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## javax.xml.xquery
Interface XQDataFactory

All Known Subinterfaces:
  XQConnection

All Known Implementing Classes:
  SaxonXQConnection, SaxonXQDataFactory

    public interface XQDataFactory

This interface represents a factory to obtain sequences, item objects and types.

The items, sequences and types obtained through this interface are independent of any connection.

The items and sequences created are immutable. The `close` method can be called to close the item or sequence and release all resources associated with this item or sequence.

Method Summary
`XQItemType` | `createAtomicType(int basetype)` Creates a new `XQItemType` object representing an XQuery atomic type.
`XQItemType` | `createAtomicType(int basetype, QName typename, URI schemaURI)` Creates a new `XQItemType` object representing an XQuery atomic type.
`XQItemType` | `createAttributeType(QName nodename, int basetype)` Creates a new `XQItemType` object representing the XQuery `attribute(nodename, basetype)` type with the given node name and base type.
`XQItemType` | `createAttributeType(QName nodename, int basetype, QName typename, URI schemaURI)` Creates a new `XQItemType` object representing the XQuery `attribute(nodename,basetype,typename,schemaURI)` type, with the given node name, base type, schema type name and schema URI.
`XQItemType` | `createCommentType()` Creates a new `XQItemType` object representing the XQuery `comment()` type.
`XQItemType` | `createDocumentElementType(XQItemType elementType)` Creates a new `XQItemType` object representing the XQuery `document-node(elementType)` type containing a single element.
`XQItemType` | `createDocumentSchemaElementType(XQItemType elementType)` Creates a new `XQItemType` object representing the XQuery `document-node(elementType)` type containing a single `schema-element(...)`.
`XQItemType` | `createDocumentType()` Creates a new `XQItemType` object representing the XQuery `document-node()` type.
`XQItemType` | `createElementType(QName nodename, int basetype)` Creates a new `XQItemType` object representing the XQuery `element(nodename, basetype)` type, with the given node name and base type.
`XQItemType` | `createElementType(QName nodename, int basetype, QName typename, URI schemaURI, boolean allowNill)` Creates a new `XQItemType` object representing the XQuery `element(nodename,basetype,typename,schemaURI, allowNill)` type, given the node name, base type, schema type name, schema URI, and nilled check.
`XQItem` | `createItem(XQItem item)` Creates a copy of the specified `XQItem`.
`XQItem` | `createItemFromAtomicValue(String value, XQItemType type)` Creates an item from a given value.
`XQItem` | `createItemFromBoolean(boolean value, XQItemType type)` Creates an item from a given value.
`XQItem` | `createItemFromByte(byte value, XQItemType type)` Creates an item from a given value.
`XQItem` | `createItemFromDocument(InputStream value, String baseURI, XQItemType type)` Creates an item from the given value.
`XQItem` | `createItemFromDocument(Reader value, String baseURI, XQItemType type)` Creates an item from the given value.
`XQItem` | `createItemFromDocument(Source value, XQItemType type)` Creates an item from the given `Source`.
`XQItem` | `createItemFromDocument(String value, String baseURI, XQItemType type)` Creates an item from the given value.
`XQItem` | `createItemFromDocument(XMLStreamReader value, XQItemType type)` Creates an item from the given value.
`XQItem` | `createItemFromDouble(double value, XQItemType type)` Creates an item from a given value.
`XQItem` | `createItemFromFloat(float value, XQItemType type)` Creates an item from a given value.
`XQItem` | `createItemFromInt(int value, XQItemType type)` Creates an item from a given value.
`XQItem` | `createItemFromLong(long value, XQItemType type)` Creates an item from a given value.
`XQItem` | `createItemFromNode(Node value, XQItemType type)` Creates an item from a given value.
`XQItem` | `createItemFromObject(Object value, XQItemType type)` Creates an item from a given value.
`XQItem` | `createItemFromShort(short value, XQItemType type)` Creates an item from a given value.
`XQItem` | `createItemFromString(String value, XQItemType type)` Creates an item from a given value.
`XQItemType` | `createItemType()` Creates a new `XQItemType` object representing the XQuery item type.
`XQItemType` | `createNodeType()` Creates a new `XQItemType` object representing the XQuery `node()` type.
`XQItemType` | `createProcessingInstructionType(String piTarget)` Creates a new `XQItemType` object representing the XQuery `processing-instruction(piTarget)` type.
`XQItemType` | `createSchemaAttributeType(QName nodename, int basetype, URI schemaURI)` Creates a new `XQItemType` object representing the XQuery `schema-attribute(nodename,basetype,schemaURI)` type, with the given node name, base type, and schema URI.
`XQItemType` | `createSchemaElementType(QName nodename, int basetype, URI schemaURI)` Creates a new `XQItemType` object representing the XQuery `schema-element(nodename,basetype,schemaURI)` type, given the node name, base type, and the schema URI.
`XQSequence` | `createSequence(Iterator i)` Creates an `XQSequence`, containing all the items from the iterator.
`XQSequence` | `createSequence(XQSequence s)` Creates a copy of the specified `XQSequence`.
`XQSequenceType` | `createSequenceType(XQItemType item, int occurence)` Creates a new sequence type from an item type and occurence indicator.
`XQItemType` | `createTextType()` Creates a new `XQItemType` object representing the XQuery `text()` type.

Method Detail

### createItemFromAtomicValue

    XQItem createItemFromAtomicValue(String value,
                                     XQItemType type)
                                     throws XQException

  Creates an item from a given value. The value is converted into an instance of the specified type according to the casting from `xs:string` rules outlined in 17.1.1 Casting from xs:string and xs:untypedAtomic, XQuery 1.0 and XPath 2.0 Functions and Operators. If the cast fails an `XQException` is thrown.

  Parameters:
    `value` - the lexical string value of the type
    `type` - the item type
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - if (1) any of the arguments are `null`, (2) given type is not an atomic type, (3) the conversion of the value to an XDM instance failed, or (4) the underlying object implementing the interface is closed

### createItemFromString

    XQItem createItemFromString(String value,
                                XQItemType type)
                                throws XQException

  Creates an item from a given value. The value is converted into an instance of the specified type, which must represent an `xs:string` or a type derived by restriction from `xs:string`. If the specified type is `null`, it defaults to `xs:string`.
  Subsequently the value is converted into an instance of the specified type according to the rule defined in 14.2 Mapping a Java Data Type to an XQuery Data Type, XQuery API for Java (XQJ) 1.0. If the conversion fails, an `XQException` will be thrown.

  Parameters:
    `value` - the value to be converted, cannot be `null`
    `type` - the type of the value to be bound to the external variable. The default type, `xs:string`, is used in case `null` is specified
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - if (1) the `value` argument is `null`, (2) the conversion of the value to an XDM instance failed, or (3) the underlying object implementing the interface is closed

### createItemFromDocument

    XQItem createItemFromDocument(String value,
                                  String baseURI,
                                  XQItemType type)
                                  throws XQException

  Creates an item from the given value.
  If the value represents a well-formed XML document, it will be parsed and results in a document node. The kind of the input type must be `null`, `XQITEMKIND_DOCUMENT_ELEMENT`, or `XQITEMKIND_DOCUMENT_SCHEMA_ELEMENT`.
  The value is converted into an instance of the specified type according to the rules defined in 14.3 Mapping a Java XML document to an XQuery document node, XQuery API for Java (XQJ) 1.0.
  If the value is not well formed, or if a kind of the input type other than the values list above is specified, behavior is implementation defined and may raise an exception.

  Parameters:
    `value` - the value to be converted, cannot be `null`
    `baseURI` - an optional base URI, can be `null`. It can be used, for example, to resolve relative URIs and to include in error messages.
    `type` - the type of the value for the created document node. If `null` is specified, it behaves as if `XQDataFactory.createDocumentElementType( XQDataFactory.createElementType(null, XQItemType.XQBASETYPE_XS_UNTYPED))` were passed in as the type parameter. That is, the type represents the XQuery sequence type `document-node(element(*, xs:untyped))`
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - if (1) the value argument is `null`, (2) the conversion of the value to an XDM instance failed, or (3) the underlying object implementing the interface is closed

### createItemFromDocument

    XQItem createItemFromDocument(Reader value,
                                  String baseURI,
                                  XQItemType type)
                                  throws XQException

  Creates an item from the given value.
  If the value represents a well-formed XML document, it will be parsed and results in a document node. The kind of the input type must be `null`, `XQITEMKIND_DOCUMENT_ELEMENT`, or `XQITEMKIND_DOCUMENT_SCHEMA_ELEMENT`.
  The value is converted into an instance of the specified type according to the rules defined in 14.3 Mapping a Java XML document to an XQuery document node, XQuery API for Java (XQJ) 1.0.
  If the value is not well formed, or if a kind of the input type other than the values list above is specified, behavior is implementation defined and may raise an exception.

  Parameters:
    `value` - the value to be converted, cannot be `null`
    `baseURI` - an optional base URI, can be `null`. It can be used, for example, to resolve relative URIs and to include in error messages.
    `type` - the type of the value for the created document node. If `null` is specified, it behaves as if `XQDataFactory.createDocumentElementType( XQDataFactory.createElementType(null, XQItemType.XQBASETYPE_XS_UNTYPED))` were passed in as the type parameter. That is, the type represents the XQuery sequence type `document-node(element(*, xs:untyped))`
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - if (1) the value argument is `null`, (2) the conversion of the value to an XDM instance failed, or (3) the underlying object implementing the interface is closed

### createItemFromDocument

    XQItem createItemFromDocument(InputStream value,
                                  String baseURI,
                                  XQItemType type)
                                  throws XQException

  Creates an item from the given value.
  If the value represents a well-formed XML document, it will be parsed and results in a document node. The kind of the input type must be `null`, `XQITEMKIND_DOCUMENT_ELEMENT`, or `XQITEMKIND_DOCUMENT_SCHEMA_ELEMENT`.
  The value is converted into an instance of the specified type according to the rules defined in 14.3 Mapping a Java XML document to an XQuery document node, XQuery API for Java (XQJ) 1.0.
  If the value is not well formed, or if a kind of the input type other than the values list above is specified, behavior is implementation defined and may raise an exception.

  Parameters:
    `value` - the value to be converted, cannot be `null`
    `baseURI` - an optional base URI, can be `null`. It can be used, for example, to resolve relative URIs and to include in error messages.
    `type` - the type of the value for the created document node. If `null` is specified, it behaves as if `XQDataFactory.createDocumentElementType( XQDataFactory.createElementType(null, XQItemType.XQBASETYPE_XS_UNTYPED))` were passed in as the type parameter. That is, the type represents the XQuery sequence type `document-node(element(*, xs:untyped))`
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - if (1) the value argument is `null`, (2) the conversion of the value to an XDM instance failed, or (3) the underlying object implementing the interface is closed

### createItemFromDocument

    XQItem createItemFromDocument(XMLStreamReader value,
                                  XQItemType type)
                                  throws XQException

  Creates an item from the given value.
  If the value represents a well-formed XML document, it results in a document node. The kind of the input type must be `null`, `XQITEMKIND_DOCUMENT_ELEMENT` or `XQITEMKIND_DOCUMENT_SCHEMA_ELEMENT`.
  The value is converted into an instance of the specified type according to the rules defined in 14.3 Mapping a Java XML document to an XQuery document node, XQuery API for Java (XQJ) 1.0.
  If the value is not well formed, or if a kind of the input type other than the values list above is specified, behavior is implementation defined and may raise an exception.

  Parameters:
    `value` - the value to be converted, cannot be `null`
    `type` - the type of the value for the created document node. If `null` is specified, it behaves as if `XQDataFactory.createDocumentElementType( XQDataFactory.createElementType(null, XQItemType.XQBASETYPE_XS_UNTYPED))` were passed in as the type parameter. That is, the type represents the XQuery sequence type `document-node(element(*, xs:untyped))`
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - if (1) the value argument is `null`, (2) the conversion of the value to an XDM instance failed, or (3) the underlying object implementing the interface is closed

### createItemFromDocument

    XQItem createItemFromDocument(Source value,
                                  XQItemType type)
                                  throws XQException

  Creates an item from the given `Source`. An XQJ implementation must at least support the following implementations:
  - `javax.xml.transform.dom.DOMSource`
  - `javax.xml.transform.sax.SAXSource`
  - `javax.xml.transform.stream.StreamSource`
  If the value represents a well-formed XML document, it will result in a document node. The kind of the input type must be `null`, `XQITEMKIND_DOCUMENT_ELEMENT`, or `XQITEMKIND_DOCUMENT_SCHEMA_ELEMENT`.
  The value is converted into an instance of the specified type according to the rules defined in 14.3 Mapping a Java XML document to an XQuery document node, XQuery API for Java (XQJ) 1.0.
  If the value is not well formed, or if a kind of the input type other than the values list above is specified, behavior is implementation defined and may raise an exception.

  Parameters:
    `value` - the value to be converted, cannot be `null`
    `type` - the type of the value for the created document node. If `null` is specified, it behaves as if `XQDataFactory.createDocumentElementType( XQDataFactory.createElementType(null, XQItemType.XQBASETYPE_XS_UNTYPED))` were passed in as the type parameter. That is, the type represents the XQuery sequence type `document-node(element(*, xs:untyped))`
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - if (1) the value argument is `null`, (2) the conversion of the value to an XDM instance failed, or (3) the underlying object implementing the interface is closed

### createItemFromObject

    XQItem createItemFromObject(Object value,
                                XQItemType type)
                                throws XQException

  Creates an item from a given value. The value is converted into an instance of the specified type according to the rule defined in 14.2 Mapping a Java Data Type to an XQuery Data Type, XQuery API for Java (XQJ) 1.0. If the converstion fails, an `XQException` will be thrown.

  Parameters:
    `value` - the value to be converted, cannot be `null`
    `type` - the type of the value to be bound to the external variable. The default type of the value is used in case `null` is specified
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - if (1) the `value` argument is `null`, (2) the conversion of the value to an XDM instance failed, or (3) the underlying object implementing the interface is closed

### createItemFromBoolean

    XQItem createItemFromBoolean(boolean value,
                                 XQItemType type)
                                 throws XQException

  Creates an item from a given value. The value is converted into an instance of the specified type according to the rule defined in 14.2 Mapping a Java Data Type to an XQuery Data Type, XQuery API for Java (XQJ) 1.0. If the converstion fails, an `XQException` will be thrown.

  Parameters:
    `value` - the value to be converted
    `type` - the type of the value to be bound to the external variable. The default type of the value is used in case `null` is specified
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - (1) the conversion of the value to an XDM instance failed, or (2) the underlying object implementing the interface is closed

### createItemFromByte

    XQItem createItemFromByte(byte value,
                              XQItemType type)
                              throws XQException

  Creates an item from a given value. The value is converted into an instance of the specified type according to the rule defined in 14.2 Mapping a Java Data Type to an XQuery Data Type, XQuery API for Java (XQJ) 1.0. If the converstion fails, an `XQException` will be thrown.

  Parameters:
    `value` - the value to be converted
    `type` - the type of the value to be bound to the external variable. The default type of the value is used in case `null` is specified
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - (1) the conversion of the value to an XDM instance failed, or (2) the underlying object implementing the interface is closed

### createItemFromDouble

    XQItem createItemFromDouble(double value,
                                XQItemType type)
                                throws XQException

  Creates an item from a given value. The value is converted into an instance of the specified type according to the rule defined in 14.2 Mapping a Java Data Type to an XQuery Data Type, XQuery API for Java (XQJ) 1.0. If the converstion fails, an `XQException` will be thrown.

  Parameters:
    `value` - the value to be converted
    `type` - the type of the value to be bound to the external variable. The default type of the value is used in case `null` is specified
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - (1) the conversion of the value to an XDM instance failed, or (2) the underlying object implementing the interface is closed

### createItemFromFloat

    XQItem createItemFromFloat(float value,
                               XQItemType type)
                               throws XQException

  Creates an item from a given value. The value is converted into an instance of the specified type according to the rule defined in 14.2 Mapping a Java Data Type to an XQuery Data Type, XQuery API for Java (XQJ) 1.0. If the converstion fails, an `XQException` will be thrown.

  Parameters:
    `value` - the value to be converted
    `type` - the type of the value to be bound to the external variable. The default type of the value is used in case `null` is specified
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - (1) the conversion of the value to an XDM instance failed, or (2) the underlying object implementing the interface is closed

### createItemFromInt

    XQItem createItemFromInt(int value,
                             XQItemType type)
                             throws XQException

  Creates an item from a given value. The value is converted into an instance of the specified type according to the rule defined in 14.2 Mapping a Java Data Type to an XQuery Data Type, XQuery API for Java (XQJ) 1.0. If the converstion fails, an `XQException` will be thrown.

  Parameters:
    `value` - the value to be converted
    `type` - the type of the value to be bound to the external variable. The default type of the value is used in case `null` is specified
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - (1) the conversion of the value to an XDM instance failed, or (2) the underlying object implementing the interface is closed

### createItemFromLong

    XQItem createItemFromLong(long value,
                              XQItemType type)
                              throws XQException

  Creates an item from a given value. The value is converted into an instance of the specified type according to the rule defined in 14.2 Mapping a Java Data Type to an XQuery Data Type, XQuery API for Java (XQJ) 1.0. If the converstion fails, an `XQException` will be thrown.

  Parameters:
    `value` - the value to be converted
    `type` - the type of the value to be bound to the external variable. The default type of the value is used in case `null` is specified
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - (1) the conversion of the value to an XDM instance failed, or (2) the underlying object implementing the interface is closed

### createItemFromNode

    XQItem createItemFromNode(Node value,
                              XQItemType type)
                              throws XQException

  Creates an item from a given value. The value is converted into an instance of the specified type according to the rule defined in 14.2 Mapping a Java Data Type to an XQuery Data Type, XQuery API for Java (XQJ) 1.0. If the converstion fails, an `XQException` will be thrown.

  Parameters:
    `value` - the value to be converted, cannot be `null`
    `type` - the type of the value to be bound to the external variable. The default type of the value is used in case `null` is specified
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - if (1) the `value` argument is `null`, (2) the conversion of the value to an XDM instance failed, or (3) the underlying object implementing the interface is closed

### createItemFromShort

    XQItem createItemFromShort(short value,
                               XQItemType type)
                               throws XQException

  Creates an item from a given value. The value is converted into an instance of the specified type according to the rule defined in 14.2 Mapping a Java Data Type to an XQuery Data Type, XQuery API for Java (XQJ) 1.0. If the converstion fails, an `XQException` will be thrown.

  Parameters:
    `value` - the value to be converted
    `type` - the type of the value to be bound to the external variable. The default type of the value is used in case `null` is specified
  Returns:
    `XQItem` representing the resulting item
  Throws:
    `XQException` - (1) the conversion of the value to an XDM instance failed, or (2) the underlying object implementing the interface is closed

### createItem

    XQItem createItem(XQItem item)
                      throws XQException

  Creates a copy of the specified `XQItem`. This method can be used, for example, to copy an `XQResultItem` object so that the new item is not dependant on the connection.

  Parameters:
    `item` - the `XQItem` to copy
  Returns:
    `XQItem` independent of any underlying `XQConnection` is created
  Throws:
    `XQException` - if (1) the specified item is `null`, (2) the underlying object implementing the interface is closed, (3) the specified item is closed

### createSequence

    XQSequence createSequence(XQSequence s)
                              throws XQException

  Creates a copy of the specified `XQSequence`. The newly created `XQSequence` is scrollable and independent of any underlying `XQConnection`. The new `XQSequence` will contain all items from the specified `XQSequence` starting from its current position. The copy process will implicitly perform next operations on the specified sequence to read the items. All items are consumed, the current position of the cursor is set to point after the last item.

  Parameters:
    `s` - input sequence
  Returns:
    `XQSequence` representing a copy of the input sequence
  Throws:
    `XQException` - if (1) there are errors accessing the items in the specified sequence, (2) the specified sequence is closed, (3) in the case of a forward only sequence, a get or write method has already been invoked on the current item, (4) the `s` parameter is `null`, or (5) the underlying object implementing the interface is closed

### createSequence

    XQSequence createSequence(Iterator i)
                              throws XQException

  Creates an `XQSequence`, containing all the items from the iterator. The newly created `XQSequence` is scrollable and independent of any underlying `XQConnection`. If the iterator returns an `XQItem`, it is added to the sequence. If the iterator returns any other object, an item is added to the sequence following the rules from 14.2 Mapping a Java Data Type to an XQuery Data Type, XQuery API for Java (XQJ) 1.0. If the iterator does not return any items, then an empty sequence is created.

  Parameters:
    `i` - input iterator
  Returns:
    `XQSequence` representing the sequence containing all items from the input iterator
  Throws:
    `XQException` - if (1) the conversion of any of the objects in the iterator to item fails, (2) the `i` parameter is `null`, or (3) underlying object implementing the interface is closed

### createAtomicType

    XQItemType createAtomicType(int basetype)
                                throws XQException

  Creates a new `XQItemType` object representing an XQuery atomic type. The item kind of the item type will be `XQItemType.XQITEMKIND_ATOMIC`.
  Example -

        XQConnection conn = ...;

        // to create xs:integer item type
        conn.createAtomicType(XQItemType.XQBASETYPE_INTEGER);

  Parameters:
    `basetype` - one of the `XQItemType.XQBASETYPE_*` constants. All basetype constants except the following are valid:

          XQItemType.XQBASETYPE_UNTYPED
          XQItemType.XQBASETYPE_ANYTYPE
          XQItemType.XQBASETYPE_IDREFS
          XQItemType.XQBASETYPE_NMTOKENS
          XQItemType.XQBASETYPE_ENTITIES
          XQItemType.XQBASETYPE_ANYSIMPLETYPE

  Returns:
    a new `XQItemType` representing the atomic type
  Throws:
    `XQException` - if (1) an invalid `basetype` value is passed in, or (2) the underlying object implementing the interface is closed

### createAtomicType

    XQItemType createAtomicType(int basetype,
                                QName typename,
                                URI schemaURI)
                                throws XQException

  Creates a new `XQItemType` object representing an XQuery atomic type. The item kind of the item type will be `XQItemType.XQITEMKIND_ATOMIC`.
  Example -

        XQConnection conn = ...;

        // to create po:hatsize atomic item type
        conn.createAtomicType(XQItemType.XQBASETYPE_INTEGER,
                        new QName("http://www.hatsizes.com", "hatsize","po"),
                        new URI("http://hatschema.com"));

  Parameters:
    `basetype` - one of the `XQItemType.XQBASETYPE_*` constants. All basetype constants except the following are valid:

          XQItemType.XQBASETYPE_UNTYPED
          XQItemType.XQBASETYPE_ANYTYPE
          XQItemType.XQBASETYPE_IDREFS
          XQItemType.XQBASETYPE_NMTOKENS
          XQItemType.XQBASETYPE_ENTITIES
          XQItemType.XQBASETYPE_ANYSIMPLETYPE

    `typename` - the `QName` of the type. If the `QName` refers to a predefinied type, it must match the `basetype`. Can be `null`
    `schemaURI` - the URI to the schema. Can be `null`. This can only be specified if the typename is also specified
  Returns:
    a new `XQItemType` representing the atomic type
  Throws:
    `XQException` - if (1) an invalid `basetype` value is passed in, (2) the underlying object implementing the interface is closed, (3) the implementation does not support user-defined XML schema types, or (4) if the `typename` refers to a predefinied type and does not match `basetype`

### createAttributeType

    XQItemType createAttributeType(QName nodename,
                                   int basetype)
                                   throws XQException

  Creates a new `XQItemType` object representing the XQuery `attribute(nodename, basetype)` type with the given node name and base type. This method can be used to create item type for attributes with a pre-defined schema type.
  Example -

        XQConnection conn = ..; // An XQuery connection

        - attribute() // no node name, pass null for the node name

          conn.createAttributeType(null, XQItemType.XQBASETYPE_ANYSIMPLETYPE);

        - attribute (*)  // equivalent to attribute()

          conn.createAttributeType(null, XQItemType.XQBASETYPE_ANYSIMPLETYPE);

        - attribute (person) // attribute of name person and any simple type.

          conn.createAttributeType(new QName("person"), XQItemType.XQBASETYPE_ANYSIMPLETYPE);

        - attribute(foo:bar) // node name foo:bar, type is any simple type

          conn.createAttributeType(new QName("http://www.foo.com", "bar","foo"),
                                   XQItemType.XQBASETYPE_ANYSIMPLETYPE);

        - attribute(foo:bar, xs:integer) // node name foo:bar, type is xs:integer

          conn.createAttributeType(new QName("http://www.foo.com", "bar","foo"),
                                   XQItemType.XQBASETYPE_INTEGER);

  Parameters:
    `nodename` - specifies the name of the node.`null` indicates a wildcard for the node name
    `basetype` - the base type of the attribute. One of the `XQItemType.XQBASETYPE_*` other than `XQItemType.XQBASETYPE_UNTYPED` or `XQItemType.XQBASETYPE_ANYTYPE`
  Returns:
    a new `XQItemType` representing the XQuery `attribute(nodename, basetype)` type
  Throws:
    `XQException` - if (1) the underlying object implementing the interface is closed or (2) if the base type is one of: `XQItemType.XQBASETYPE_UNTYPED` or `XQItemType.XQBASETYPE_ANYTYPE`

### createAttributeType

    XQItemType createAttributeType(QName nodename,
                                   int basetype,
                                   QName typename,
                                   URI schemaURI)
                                   throws XQException

  Creates a new `XQItemType` object representing the XQuery `attribute(nodename,basetype,typename,schemaURI)` type, with the given node name, base type, schema type name and schema URI. The type name can reference either pre-defined simple types or user-defined simple types.
  Example -

        XQConnection conn = ..; // An XQuery connection

        - attribute (name, employeename) // attribute name of type employeename

        conn.createAttributeType(new QName("name"), XQItemType.XQBASETYPE_ANYSIMPLETYPE,
                                 new QName("employeename"), null);

        - attribute (foo:bar, po:city)
        where the prefix foo refers to the namespace http://www.foo.com and the
        prefix po refers to the namespace "http://www.address.com"

        conn.createAttributeType(new QName("http://www.foo.com", "bar","foo"),
                                 XQItemType.XQBASETYPE_ANYSIMPLETYPE,
                                 new QName("http://address.com", "address","po"), null);

        - attribute (zip, zipcode) // attribute zip of type zipchode which derives from
                                   // xs:string

        conn.createAttributeType(new QName("zip"), XQItemType.XQBASETYPE_STRING,
                                 new QName("zipcode"), null);

        - attribute(foo:bar, po:hatsize)
        where the prefix foo refers to the namespace http://www.foo.com and the
        prefix po refers to the namespace "http://www.hatsizes.com"
        with schema URI "http://hatschema.com"

        conn.createAttributeType(new QName("http://www.foo.com", "bar","foo"),
                        XQItemType.XQBASETYPE_INTEGER,
                        new QName("http://www.hatsizes.com", "hatsize","po"),
                        new QName("http://hatschema.com"));

  Parameters:
    `nodename` - specifies the name of the node.`null` indicates a wildcard for the node name
    `basetype` - the base type of the attribute. One of the `XQItemTyupe.XQBASETYPE_*` constants other than `XQItemType.XQBASETYPE_UNTYPED` or `XQItemType.XQBASETYPE_ANYTYPE`
    `typename` - the `QName` of the type. If the `QName` refers to a predefinied type, it must match the `basetype`. Can be `null`.
    `schemaURI` - the URI to the schema. Can be `null`. This can only be specified if the typename is also specified
  Returns:
    a new `XQItemType` representing the XQuery `attribute(nodename,basetype, typename,schemaURI)` type.
  Throws:
    `XQException` - if (1) the underlying object implementing the interface is closed, (2) if the base type is one of: `XQItemType.XQBASETYPE_UNTYPED` or `XQItemType.XQBASETYPE_ANYTYPE`, (3) the schema URI is specified and the typename is not specified, (4) the implementation does not support user-defined XML schema types, or (5) if the `typename` refers to a predefinied type and does not match `basetype`

### createSchemaAttributeType

    XQItemType createSchemaAttributeType(QName nodename,
                                         int basetype,
                                         URI schemaURI)
                                         throws XQException

  Creates a new `XQItemType` object representing the XQuery `schema-attribute(nodename,basetype,schemaURI)` type, with the given node name, base type, and schema URI.
  Example -

           XQConnection conn = ..; // An XQuery connection

           - schema-attribute (name) // schema-attribute name, found in the schema
                                     // available at http://customerschema.com

           conn.createSchemaAttributeType(new QName("name"),
                        XQItemType.XQBASETYPE_STRING,
                        new URI(http://customerschema.com));

  Parameters:
    `nodename` - specifies the name of the node
    `basetype` - the base type of the attribute. One of the `XQItemTyupe.XQBASETYPE_*` constants other than `XQItemType.XQBASETYPE_UNTYPED` or `XQItemType.XQBASETYPE_ANYTYPE`
    `schemaURI` - the URI to the schema. Can be `null`
  Returns:
    a new `XQItemType` representing the XQuery `schema-attribute(nodename,basetype, schemaURI)` type
  Throws:
    `XQException` - if (1) the node name is `null`, (2) if the base type is one of: `XQItemType.XQBASETYPE_UNTYPED` or `XQItemType.XQBASETYPE_ANYTYPE`, (3) the underlying object implementing the interface is closed, or (4) the implementation does not support user-defined XML schema types

### createCommentType

    XQItemType createCommentType()
                                 throws XQException

  Creates a new `XQItemType` object representing the XQuery `comment()` type. The `XQItemType` object will have the item kind set to `XQItemType.XQITEMKIND_COMMENT`.
  Example -

        XQConnection conn = ..; // An XQuery connection
        XQItemType cmttype = conn.createCommentType();

        int itemkind = cmttype.getItemKind(); // will be XQItemType.XQITEMKIND_COMMENT

        XQExpression expr = conn.createExpression();
        XQSequence result = expr.executeQuery("<!-- comments -->");

        result.next();
        boolean pi = result.instanceOf(cmttype);  // will be true

  Returns:
    a new `XQItemType` representing the XQuery `comment()` type
  Throws:
    `XQException` - if the underlying object implementing the interface is closed

### createDocumentElementType

    XQItemType createDocumentElementType(XQItemType elementType)
                                         throws XQException

  Creates a new `XQItemType` object representing the XQuery `document-node(elementType)` type containing a single element. The `XQItemType` object will have the item kind set to `XQItemType.XQITEMKIND_DOCUMENT_ELEMENT` and the base type set to the item type of the input `elementType`.

  Parameters:
    `elementType` - an `XQItemType` object representing an XQuery `element()` type, cannot be `null`
  Returns:
    a new `XQItemType` representing the XQuery `document-node(elementType)` type containing a single element
  Throws:
    `XQException` - if (1) the underlying object implementing the interface is closed or (2) the `elementType` has an item kind different from `XQItemType.XQITEMKIND_ELEMENT`, (3) the `elementType` argument is `null`, or (4) the implementation does not support user-defined XML schema types

### createDocumentSchemaElementType

    XQItemType createDocumentSchemaElementType(XQItemType elementType)
                                               throws XQException

  Creates a new `XQItemType` object representing the XQuery `document-node(elementType)` type containing a single `schema-element(...)`. The `XQItemType` object will have the item kind set to `XQItemType.XQITEMKIND_DOCUMENT_SCHEMA_ELEMENT` and the base type set to the item type of the input `elementType`.

  Parameters:
    `elementType` - an `XQItemType` object representing an XQuery `schema-element(...)` type, cannot be `null`
  Returns:
    a new `XQItemType` representing the XQuery `document-node(elementType)` type containing a single `schema-element(...)` element
  Throws:
    `XQException` - if (1) the underlying object implementing the interface is closed or (2) the `elementType` has an item kind different from `XQItemType.XQITEMKIND_SCHEMA_ELEMENT`, (3) the `elementType` argument is `null`, (4) the implementation does not support user-defined XML schema types

### createDocumentType

    XQItemType createDocumentType()
                                  throws XQException

  Creates a new `XQItemType` object representing the XQuery `document-node()` type. The `XQItemType` object will have the item kind set to `XQItemType.XQITEMKIND_DOCUMENT`.

  Returns:
    a new `XQItemType` representing the XQuery `document-node()` type
  Throws:
    `XQException` - if the underlying object implementing the interface is closed

### createElementType

    XQItemType createElementType(QName nodename,
                                 int basetype)
                                 throws XQException

  Creates a new `XQItemType` object representing the XQuery `element(nodename, basetype)` type, with the given node name and base type. This method can be used to create item type for elements with a pre-defined schema type.
  Example -

        XQConnection conn = ..; // An XQuery connection
        - element() // no node name, pass null for the node name

        conn.createElementType(null, XQItemType.XQBASETYPE_ANYTYPE);

        - element (*)  // equivalent to element()

        conn.createElementType(null, XQItemType.XQBASETYPE_ANYTYPE);

        - element(person) // element of name person and any type.

        conn.createElementType(new QName("person"), XQItemType.XQBASETYPE_ANYTYPE);

        - element(foo:bar) // node name foo:bar, type is anytype

        conn.createElementType(new QName("http://www.foo.com", "bar","foo"),
                               XQItemType.XQBASETYPE_ANYTYPE);

        - element(foo:bar, xs:integer) // node name foo:bar, type is xs:integer

        conn.createElementType(new QName("http://www.foo.com", "bar","foo"),
                               XQItemType.XQBASETYPE_INTEGER);

  Parameters:
    `nodename` - specifies the name of the node. `null` indicates a wildcard for the node name
    `basetype` - the base type of the item. One of the `XQItemType.XQBASETYPE_*` constants
  Returns:
    a new `XQItemType` representing the XQuery `element(nodename, basetype)` type
  Throws:
    `XQException` - if (1) the underlying object implementing the interface is closed

### createElementType

    XQItemType createElementType(QName nodename,
                                 int basetype,
                                 QName typename,
                                 URI schemaURI,
                                 boolean allowNill)
                                 throws XQException

  Creates a new `XQItemType` object representing the XQuery `element(nodename,basetype,typename,schemaURI, allowNill)` type, given the node name, base type, schema type name, schema URI, and nilled check. The type name can reference either pre-defined schema types or user-defined types.
  Example -

        XQConnection conn = ..; // An XQuery connection

        - element (person, employee) // element person of type employee

        conn.createElementType(new QName("person"), XQItemType.XQBASETYPE_ANYTYPE,
                               new QName("employee"), null ,false);

        - element(person, employee ? ) // element person of type employee, whose nilled
                                       // property may be true or false.

        conn.createElementType(new QName("person"), XQItemType.XQBASETYPE_ANYTYPE,
                               new QName("employee"), null ,true);

        - element(foo:bar, po:address)
        where the prefix foo refers to the namespace http://www.foo.com and the
        prefix po refers to the namespace "http://www.address.com"

        conn.createElementType(new QName("http://www.foo.com", "bar","foo"),
                     XQItemType.XQBASETYPE_ANYTYPE,
                     new QName("http://address.com", "address","po"), null, false);

        - element (zip, zipcode) // element zip of type zipchode which derives from
                                 // xs:string

        conn.createElementType(new QName("zip"), XQItemType.XQBASETYPE_STRING,
                               new QName("zipcode"), null, false);

        - element (*, xs:anyType ?)

        conn.createElementType(null, XQItemType.XQBASETYPE_ANYTYPE, null, null, true);

        - element(foo:bar, po:hatsize)
        where the prefix foo refers to the namespace http://www.foo.com and the
        prefix po refers to the namespace "http://www.hatsizes.com"
        with schema URI "http://hatschema.com"

        conn.createElementType(new QName("http://www.foo.com", "bar","foo"),
                            XQItemType.XQBASETYPE_INTEGER,
                            new QName("http://www.hatsizes.com", "hatsize","po"),
                            new QName("http://hatschema.com"), false);

  Parameters:
    `nodename` - specifies the name of the element. `null` indicates a wildcard for the node name
    `basetype` - the base type of the item. One of the `XQItemType.XQBASETYPE_*` constants
    `typename` - the `QName` of the type. If the `QName` refers to a predefinied type, it must match the `basetype`. Can be `null`
    `schemaURI` - the URI to the schema. Can be `null`. This can only be specified if the typename is also specified
    `allowNill` - the nilled property of the element
  Returns:
    a new `XQItemType` representing the XQuery `element(nodename,basetype, typename,schemaURI, allowNill)` type
  Throws:
    `XQException` - if (1) schemaURI is specified but the typename is not specified, (2) the underlying object implementing the interface is closed, (3) the implementation does not support user-defined XML schema types, or (4) if the `typename` refers to a predefinied type and does not match `basetype`

### createSchemaElementType

    XQItemType createSchemaElementType(QName nodename,
                                       int basetype,
                                       URI schemaURI)
                                       throws XQException

  Creates a new `XQItemType` object representing the XQuery `schema-element(nodename,basetype,schemaURI)` type, given the node name, base type, and the schema URI.
  Example -

           XQConnection conn = ..; // An XQuery connection

           - schema-element (customer) // schema-element person, found in
                                       // the schema available at http://customerschema.com

           conn.createElementType(new QName("customer"), XQItemType.XQBASETYPE_ANYTYPE,
                               new URI("http://customerschema.com"));

  Parameters:
    `nodename` - specifies the name of the element
    `basetype` - the base type of the item. One of the `XQItemType.XQBASETYPE_*` constants
    `schemaURI` - the URI to the schema. Can be `null`
  Returns:
    a new `XQItemType` representing the XQuery `schema-element(nodename,basetype, schemaURI)` type
  Throws:
    `XQException` - if (1) the node name is `null`, (2) the underlying object implementing the interface is closed, or (3) the implementation does not support user-defined XML schema types

### createItemType

    XQItemType createItemType()
                              throws XQException

  Creates a new `XQItemType` object representing the XQuery item type. The `XQItemType` object will have the item kind set to `XQItemType.XQITEMKIND_ITEM`.
  Example -

        XQConnection conn = ..; // An XQuery connection
        XQItemType typ = conn.createItemType(); // represents the XQuery item type "item()"

  Returns:
    a new `XQItemType` representing the XQuery item type
  Throws:
    `XQException` - if the underlying object implementing the interface is closed

### createNodeType

    XQItemType createNodeType()
                              throws XQException

  Creates a new `XQItemType` object representing the XQuery `node()` type. The `XQItemType` object will have the item kind set to `XQItemType.XQITEMKIND_NODE`.

  Returns:
    a new `XQItemType` representing the XQuery `node()` type
  Throws:
    `XQException` - if the underlying object implementing the interface is closed

### createProcessingInstructionType

    XQItemType createProcessingInstructionType(String piTarget)
                                               throws XQException

  Creates a new `XQItemType` object representing the XQuery `processing-instruction(piTarget)` type. The `XQItemType` object will have the item kind set to `XQItemType.XQITEMKIND_PI`. A string literal can be passed to match the PITarget of the processing instruction as described in 2.5.4.2 Matching an Item Type and an Item, XQuery 1.0: An XML Query Language.
  Example -

         XQConnection conn = ..; // An XQuery connection
         XQItemType anypi = conn.createProcessingInstructionType();
         XQItemType foopi = conn.createProcessingInstructionType("foo-format");

         XQExpression expr = conn.createExpression();
         XQSequence result = expr.executeQuery("<?format role="output" ?>");

         result.next();
         boolean pi = result.instanceOf(anypi);  // will be true
         pi = result.instanceOf(foopi);  // will be false

         XQExpression expr = conn.createExpression();
         XQSequence result = expr.executeQuery("<?foo-format role="output" ?>");

         result.next();
         boolean pi = result.instanceOf(anypi);  // will be true
         pi = result.instanceOf(foopi);  // will be true

  Parameters:
    `piTarget` - the string literal to match the processing instruction's PITarget. A `null` string value will match all processing instruction nodes
  Returns:
    a new `XQItemType` representing the XQuery `processing-instruction(piTarget)` type
  Throws:
    `XQException` - if the underlying object implementing the interface is closed

### createSequenceType

    XQSequenceType createSequenceType(XQItemType item,
                                      int occurence)
                                      throws XQException

  Creates a new sequence type from an item type and occurence indicator.

  Parameters:
    `item` - the item type. This parameter must be `null` if the occurance is `XQSequenceType.OCC_EMPTY`, and cannot be `null` for any other occurance indicator
    `occurence` - The occurence of the item type, must be one of `XQSequenceType.OCC_ZERO_OR_ONE`, `XQSequenceType.OCC_EXACTLY_ONE`, `XQSequenceType.OCC_ZERO_OR_MORE`, `XQSequenceType.OCC_ONE_OR_MORE`, `XQSequenceType.OCC_EMPTY`
  Returns:
    a new `XQSequenceType` representing the type of a sequence
  Throws:
    `XQException` - if (1) the `item` is `null` and the occurance is not `XQSequenceType.OCC_EMPTY`, (2) the `item` is not `null` and the occurance is `XQSequenceType.OCC_EMPTY`, (3) the occurence is not one of: `XQSequenceType.OCC_ZERO_OR_ONE`, `XQSequenceType.OCC_EXACTLY_ONE`, `XQSequenceType.OCC_ZERO_OR_MORE`, `XQSequenceType.OCC_ONE_OR_MORE`, `XQSequenceType.OCC_EMPTY` or (4) the underlying object implementing the interface is closed

### createTextType

    XQItemType createTextType()
                              throws XQException

  Creates a new `XQItemType` object representing the XQuery `text()` type. The `XQItemType` object will have the item kind set to `XQItemType.XQITEMKIND_TEXT`.

  Returns:
    a new `XQItemType` representing the XQuery `text()` type
  Throws:
    `XQException` - if the underlying object implementing the interface is closed

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