org.apache.xml.dtm

## Interface DTM

- All Known Implementing Classes:
    AdaptiveResultTreeImpl, DOM2DTM, DTMDefaultBase, DTMDefaultBaseIterators, DTMDefaultBaseTraversers, DTMDocument, DTMDocumentImpl, SAX2DTM, SAX2DTM2, SAX2RTFDTM, SAXImpl, SimpleResultTreeImpl, SQLDocument, SQLErrorDocument

      public interface DTM

  `DTM` is an XML document model expressed as a table rather than an object tree. It attempts to provide an interface to a parse tree that has very little object creation. (DTM implementations may also support incremental construction of the model, but that's hidden from the DTM API.)

  Nodes in the DTM are identified by integer "handles". A handle must be unique within a process, and carries both node identification and document identification. It must be possible to compare two handles (and thus their nodes) for identity with "==".

  Namespace URLs, local-names, and expanded-names can all be represented by and tested as integer ID values. An expanded name represents (and may or may not directly contain) a combination of the URL ID, and the local-name ID. Note that the namespace URL id can be 0, which should have the meaning that the namespace is null. For consistancy, zero should not be used for a local-name index.

  Text content of a node is represented by an index and length, permitting efficient storage such as a shared FastStringBuffer.

  The model of the tree, as well as the general navigation model, is that of XPath 1.0, for the moment. The model will eventually be adapted to match the XPath 2.0 data model, XML Schema, and InfoSet.

  DTM does _not_ directly support the W3C's Document Object Model. However, it attempts to come close enough that an implementation of DTM can be created that wraps a DOM and vice versa.

  Please Note: The DTM API is still Subject To Change. This wouldn't affect most users, but might require updating some extensions.

  The largest change being contemplated is a reconsideration of the Node Handle representation. We are still not entirely sure that an integer packed with two numeric subfields is really the best solution. It has been suggested that we move up to a Long, to permit more nodes per document without having to reduce the number of slots in the DTMManager. There's even been a proposal that we replace these integers with "cursor" objects containing the internal node id and a pointer to the actual DTM object; this might reduce the need to continuously consult the DTMManager to retrieve the latter, and might provide a useful "hook" back into normal Java heap management. But changing this datatype would have huge impact on Xalan's internals -- especially given Java's lack of C-style typedefs -- so we won't cut over unless we're convinced the new solution really would be an improvement!

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static short` | `ATTRIBUTE_NODE` The node is an `Attr`.
    `static short` | `CDATA_SECTION_NODE` The node is a `CDATASection`.
    `static short` | `COMMENT_NODE` The node is a `Comment`.
    `static short` | `DOCUMENT_FRAGMENT_NODE` The node is a `DocumentFragment`.
    `static short` | `DOCUMENT_NODE` The node is a `Document`.
    `static short` | `DOCUMENT_TYPE_NODE` The node is a `DocumentType`.
    `static short` | `ELEMENT_NODE` The node is an `Element`.
    `static short` | `ENTITY_NODE` The node is an `Entity`.
    `static short` | `ENTITY_REFERENCE_NODE` The node is an `EntityReference`.
    `static short` | `NAMESPACE_NODE` The node is a `namespace node`.
    `static short` | `NOTATION_NODE` The node is a `Notation`.
    `static short` | `NTYPES` The number of valid nodetypes.
    `static int` | `NULL` Null node handles are represented by this value.
    `static short` | `PROCESSING_INSTRUCTION_NODE` The node is a `ProcessingInstruction`.
    `static short` | `ROOT_NODE` The node is a `Root`.
    `static short` | `TEXT_NODE` The node is a `Text` node.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `appendChild(int newChild, boolean clone, boolean cloneDepth)` Append a child to "the end of the document".
    `void` | `appendTextChild(java.lang.String str)` Append a text node child that will be constructed from a string, to the end of the document.
    `void` | `dispatchCharactersEvents(int nodeHandle, ContentHandler ch, boolean normalize)` Directly call the characters method on the passed ContentHandler for the string-value of the given node (see http://www.w3.org/TR/xpath#data-model for the definition of a node's string-value).
    `void` | `dispatchToEvents(int nodeHandle, ContentHandler ch)` Directly create SAX parser events representing the XML content of a DTM subtree.
    `void` | `documentRegistration()` As the DTM is registered with the DTMManager, this method will be called.
    `void` | `documentRelease()` As documents are released from the DTMManager, the DTM implementation will be notified of the event.
    `int` | `getAttributeNode(int elementHandle, java.lang.String namespaceURI, java.lang.String name)` Retrieves an attribute node by local name and namespace URI %TBD% Note that we currently have no way to support the DOM's old getAttribute() call, which accesses only the qname.
    `DTMAxisIterator` | `getAxisIterator(int axis)` This is a shortcut to the iterators that implement XPath axes.
    `DTMAxisTraverser` | `getAxisTraverser(int axis)` This returns a stateless "traverser", that can navigate over an XPath axis, though not in document order.
    `ContentHandler` | `getContentHandler()` Return this DTM's content handler, if it has one.
    `DeclHandler` | `getDeclHandler()` Return this DTM's DeclHandler, if it has one.
    `int` | `getDocument()` Given a DTM which contains only a single document, find the Node Handle of the Document node.
    `boolean` | `getDocumentAllDeclarationsProcessed()` Return an indication of whether the processor has read the complete DTD.
    `java.lang.String` | `getDocumentBaseURI()` Return the base URI of the document entity.
    `java.lang.String` | `getDocumentEncoding(int nodeHandle)` Return the name of the character encoding scheme in which the document entity is expressed.
    `int` | `getDocumentRoot(int nodeHandle)` Given a node handle, find the owning document node.
    `java.lang.String` | `getDocumentStandalone(int nodeHandle)` Return an indication of the standalone status of the document, either "yes" or "no".
    `java.lang.String` | `getDocumentSystemIdentifier(int nodeHandle)` Return the system identifier of the document entity.
    `java.lang.String` | `getDocumentTypeDeclarationPublicIdentifier()` Return the public identifier of the external subset, normalized as described in 4.2.2 External Entities [XML].
    `java.lang.String` | `getDocumentTypeDeclarationSystemIdentifier()` A document type declaration information item has the following properties: 1.
    `java.lang.String` | `getDocumentVersion(int documentHandle)` Return a string representing the XML version of the document.
    `DTDHandler` | `getDTDHandler()` Return this DTM's DTDHandler, if it has one.
    `int` | `getElementById(java.lang.String elementId)` Returns the `Element` whose `ID` is given by `elementId`.
    `EntityResolver` | `getEntityResolver()` Return this DTM's EntityResolver, if it has one.
    `ErrorHandler` | `getErrorHandler()` Return this DTM's ErrorHandler, if it has one.
    `int` | `getExpandedTypeID(int nodeHandle)` Given a node handle, return an ID that represents the node's expanded name.
    `int` | `getExpandedTypeID(java.lang.String namespace, java.lang.String localName, int type)` Given an expanded name, return an ID.
    `int` | `getFirstAttribute(int nodeHandle)` Given a node handle, get the index of the node's first attribute.
    `int` | `getFirstChild(int nodeHandle)` Given a node handle, get the handle of the node's first child.
    `int` | `getFirstNamespaceNode(int nodeHandle, boolean inScope)` Given a node handle, get the index of the node's first namespace node.
    `int` | `getLastChild(int nodeHandle)` Given a node handle, get the handle of the node's last child.
    `short` | `getLevel(int nodeHandle)` Get the depth level of this node in the tree (equals 1 for a parentless node).
    `LexicalHandler` | `getLexicalHandler()` Return this DTM's lexical handler, if it has one.
    `java.lang.String` | `getLocalName(int nodeHandle)` Given a node handle, return its DOM-style localname.
    `java.lang.String` | `getLocalNameFromExpandedNameID(int ExpandedNameID)` Given an expanded-name ID, return the local name part.
    `java.lang.String` | `getNamespaceFromExpandedNameID(int ExpandedNameID)` Given an expanded-name ID, return the namespace URI part.
    `java.lang.String` | `getNamespaceURI(int nodeHandle)` Given a node handle, return its DOM-style namespace URI (As defined in Namespaces, this is the declared URI which this node's prefix -- or default in lieu thereof -- was mapped to.)
    `int` | `getNextAttribute(int nodeHandle)` Given a node handle, advance to the next attribute.
    `int` | `getNextNamespaceNode(int baseHandle, int namespaceHandle, boolean inScope)` Given a namespace handle, advance to the next namespace in the same scope (local or local-plus-inherited, as selected by getFirstNamespaceNode)
    `int` | `getNextSibling(int nodeHandle)` Given a node handle, advance to its next sibling.
    `Node` | `getNode(int nodeHandle)` Return an DOM node for the given node.
    `java.lang.String` | `getNodeName(int nodeHandle)` Given a node handle, return its DOM-style node name.
    `java.lang.String` | `getNodeNameX(int nodeHandle)` Given a node handle, return the XPath node name.
    `short` | `getNodeType(int nodeHandle)` Given a node handle, return its DOM-style node type.
    `java.lang.String` | `getNodeValue(int nodeHandle)` Given a node handle, return its node value.
    `int` | `getOwnerDocument(int nodeHandle)` Given a node handle, find the owning document node.
    `int` | `getParent(int nodeHandle)` Given a node handle, find its parent node.
    `java.lang.String` | `getPrefix(int nodeHandle)` Given a namespace handle, return the prefix that the namespace decl is mapping.
    `int` | `getPreviousSibling(int nodeHandle)` Given a node handle, find its preceeding sibling.
    `SourceLocator` | `getSourceLocatorFor(int node)` Get the location of a node in the source document.
    `XMLString` | `getStringValue(int nodeHandle)` Get the string-value of a node as a String object (see http://www.w3.org/TR/xpath#data-model for the definition of a node's string-value).
    `char[]` | `getStringValueChunk(int nodeHandle, int chunkIndex, int[] startAndLen)` Get a character array chunk in the string-value of a node.
    `int` | `getStringValueChunkCount(int nodeHandle)` Get number of character array chunks in the string-value of a node.
    `DTMAxisIterator` | `getTypedAxisIterator(int axis, int type)` Get an iterator that can navigate over an XPath Axis, predicated by the extended type ID.
    `java.lang.String` | `getUnparsedEntityURI(java.lang.String name)` The getUnparsedEntityURI function returns the URI of the unparsed entity with the specified name in the same document as the context node (see [3.3 Unparsed Entities]).
    `boolean` | `hasChildNodes(int nodeHandle)` Given a node handle, test if it has child nodes.
    `boolean` | `isAttributeSpecified(int attributeHandle)` 5.
    `boolean` | `isCharacterElementContentWhitespace(int nodeHandle)` 2.
    `boolean` | `isDocumentAllDeclarationsProcessed(int documentHandle)` 10.
    `boolean` | `isNodeAfter(int firstNodeHandle, int secondNodeHandle)` Figure out whether nodeHandle2 should be considered as being later in the document than nodeHandle1, in Document Order as defined by the XPath model.
    `boolean` | `isSupported(java.lang.String feature, java.lang.String version)` Tests whether DTM DOM implementation implements a specific feature and that feature is supported by this node.
    `void` | `migrateTo(DTMManager manager)` Migrate a DTM built with an old DTMManager to a new DTMManager.
    `boolean` | `needsTwoThreads()`
    `void` | `setDocumentBaseURI(java.lang.String baseURI)` Set the base URI of the document entity.
    `void` | `setFeature(java.lang.String featureId, boolean state)` Set an implementation dependent feature.
    `void` | `setProperty(java.lang.String property, java.lang.Object value)` Set a run time property for this DTM instance.
    `boolean` | `supportsPreStripping()` Return true if the xsl:strip-space or xsl:preserve-space was processed during construction of the document contained in this DTM.

- - ### Field Detail

    - #### NULL

          static final int NULL

      Null node handles are represented by this value.
      See Also:
        Constant Field Values

    - #### ROOT_NODE

          static final short ROOT_NODE

      The node is a `Root`.
      See Also:
        Constant Field Values

    - #### ELEMENT_NODE

          static final short ELEMENT_NODE

      The node is an `Element`.
      See Also:
        Constant Field Values

    - #### ATTRIBUTE_NODE

          static final short ATTRIBUTE_NODE

      The node is an `Attr`.
      See Also:
        Constant Field Values

    - #### TEXT_NODE

          static final short TEXT_NODE

      The node is a `Text` node.
      See Also:
        Constant Field Values

    - #### CDATA_SECTION_NODE

          static final short CDATA_SECTION_NODE

      The node is a `CDATASection`.
      See Also:
        Constant Field Values

    - #### ENTITY_REFERENCE_NODE

          static final short ENTITY_REFERENCE_NODE

      The node is an `EntityReference`.
      See Also:
        Constant Field Values

    - #### ENTITY_NODE

          static final short ENTITY_NODE

      The node is an `Entity`.
      See Also:
        Constant Field Values

    - #### PROCESSING_INSTRUCTION_NODE

          static final short PROCESSING_INSTRUCTION_NODE

      The node is a `ProcessingInstruction`.
      See Also:
        Constant Field Values

    - #### COMMENT_NODE

          static final short COMMENT_NODE

      The node is a `Comment`.
      See Also:
        Constant Field Values

    - #### DOCUMENT_NODE

          static final short DOCUMENT_NODE

      The node is a `Document`.
      See Also:
        Constant Field Values

    - #### DOCUMENT_TYPE_NODE

          static final short DOCUMENT_TYPE_NODE

      The node is a `DocumentType`.
      See Also:
        Constant Field Values

    - #### DOCUMENT_FRAGMENT_NODE

          static final short DOCUMENT_FRAGMENT_NODE

      The node is a `DocumentFragment`.
      See Also:
        Constant Field Values

    - #### NOTATION_NODE

          static final short NOTATION_NODE

      The node is a `Notation`.
      See Also:
        Constant Field Values

    - #### NAMESPACE_NODE

          static final short NAMESPACE_NODE

      The node is a `namespace node`. Note that this is not currently a node type defined by the DOM API.
      See Also:
        Constant Field Values

    - #### NTYPES

          static final short NTYPES

      The number of valid nodetypes.
      See Also:
        Constant Field Values

  - ### Method Detail

    - #### setFeature

          void setFeature(java.lang.String featureId,
                        boolean state)

      Set an implementation dependent feature.

      %REVIEW% Do we really expect to set features on DTMs?

      Parameters:
        `featureId` - A feature URL.
        `state` - true if this feature should be on, false otherwise.

    - #### setProperty

          void setProperty(java.lang.String property,
                         java.lang.Object value)

      Set a run time property for this DTM instance.
      Parameters:
        `property` - a `String` value
        `value` - an `Object` value

    - #### getAxisTraverser

          DTMAxisTraverser getAxisTraverser(int axis)

      This returns a stateless "traverser", that can navigate over an XPath axis, though not in document order.
      Parameters:
        `axis` - One of Axes.ANCESTORORSELF, etc.
      Returns:
        A DTMAxisIterator, or null if the givin axis isn't supported.

    - #### getAxisIterator

          DTMAxisIterator getAxisIterator(int axis)

      This is a shortcut to the iterators that implement XPath axes. Returns a bare-bones iterator that must be initialized with a start node (using iterator.setStartNode()).
      Parameters:
        `axis` - One of Axes.ANCESTORORSELF, etc.
      Returns:
        A DTMAxisIterator, or null if the givin axis isn't supported.

    - #### getTypedAxisIterator

          DTMAxisIterator getTypedAxisIterator(int axis,
                                             int type)

      Get an iterator that can navigate over an XPath Axis, predicated by the extended type ID.
      Parameters:
        `axis` -
        `type` - An extended type ID.
      Returns:
        A DTMAxisIterator, or null if the givin axis isn't supported.

    - #### hasChildNodes

          boolean hasChildNodes(int nodeHandle)

      Given a node handle, test if it has child nodes.

      %REVIEW% This is obviously useful at the DOM layer, where it would permit testing this without having to create a proxy node. It's less useful in the DTM API, where (dtm.getFirstChild(nodeHandle)!=DTM.NULL) is just as fast and almost as self-evident. But it's a convenience, and eases porting of DOM code to DTM.

      Parameters:
        `nodeHandle` - int Handle of the node.
      Returns:
        int true if the given node has child nodes.

    - #### getFirstChild

          int getFirstChild(int nodeHandle)

      Given a node handle, get the handle of the node's first child.
      Parameters:
        `nodeHandle` - int Handle of the node.
      Returns:
        int DTM node-number of first child, or DTM.NULL to indicate none exists.

    - #### getLastChild

          int getLastChild(int nodeHandle)

      Given a node handle, get the handle of the node's last child.
      Parameters:
        `nodeHandle` - int Handle of the node.
      Returns:
        int Node-number of last child, or DTM.NULL to indicate none exists.

    - #### getAttributeNode

          int getAttributeNode(int elementHandle,
                             java.lang.String namespaceURI,
                             java.lang.String name)

      Retrieves an attribute node by local name and namespace URI %TBD% Note that we currently have no way to support the DOM's old getAttribute() call, which accesses only the qname.
      Parameters:
        `elementHandle` - Handle of the node upon which to look up this attribute.
        `namespaceURI` - The namespace URI of the attribute to retrieve, or null.
        `name` - The local name of the attribute to retrieve.
      Returns:
        The attribute node handle with the specified name ( `nodeName`) or `DTM.NULL` if there is no such attribute.

    - #### getFirstAttribute

          int getFirstAttribute(int nodeHandle)

      Given a node handle, get the index of the node's first attribute.
      Parameters:
        `nodeHandle` - int Handle of the node.
      Returns:
        Handle of first attribute, or DTM.NULL to indicate none exists.

    - #### getFirstNamespaceNode

          int getFirstNamespaceNode(int nodeHandle,
                                  boolean inScope)

      Given a node handle, get the index of the node's first namespace node.
      Parameters:
        `nodeHandle` - handle to node, which should probably be an element node, but need not be.
        `inScope` - true if all namespaces in scope should be returned, false if only the node's own namespace declarations should be returned.
      Returns:
        handle of first namespace, or DTM.NULL to indicate none exists.

    - #### getNextSibling

          int getNextSibling(int nodeHandle)

      Given a node handle, advance to its next sibling.
      Parameters:
        `nodeHandle` - int Handle of the node.
      Returns:
        int Node-number of next sibling, or DTM.NULL to indicate none exists.

    - #### getPreviousSibling

          int getPreviousSibling(int nodeHandle)

      Given a node handle, find its preceeding sibling. WARNING: DTM implementations may be asymmetric; in some, this operation has been resolved by search, and is relatively expensive.
      Parameters:
        `nodeHandle` - the id of the node.
      Returns:
        int Node-number of the previous sib, or DTM.NULL to indicate none exists.

    - #### getNextAttribute

          int getNextAttribute(int nodeHandle)

      Given a node handle, advance to the next attribute. If an element, we advance to its first attribute; if an attr, we advance to the next attr of the same element.
      Parameters:
        `nodeHandle` - int Handle of the node.
      Returns:
        int DTM node-number of the resolved attr, or DTM.NULL to indicate none exists.

    - #### getNextNamespaceNode

          int getNextNamespaceNode(int baseHandle,
                                 int namespaceHandle,
                                 boolean inScope)

      Given a namespace handle, advance to the next namespace in the same scope (local or local-plus-inherited, as selected by getFirstNamespaceNode)
      Parameters:
        `baseHandle` - handle to original node from where the first child was relative to (needed to return nodes in document order).
        `namespaceHandle` - handle to node which must be of type NAMESPACE_NODE. NEEDSDOC @param inScope
      Returns:
        handle of next namespace, or DTM.NULL to indicate none exists.

    - #### getParent

          int getParent(int nodeHandle)

      Given a node handle, find its parent node.
      Parameters:
        `nodeHandle` - the id of the node.
      Returns:
        int Node handle of parent, or DTM.NULL to indicate none exists.

    - #### getDocument

          int getDocument()

      Given a DTM which contains only a single document, find the Node Handle of the Document node. Note that if the DTM is configured so it can contain multiple documents, this call will return the Document currently under construction -- but may return null if it's between documents. Generally, you should use getOwnerDocument(nodeHandle) or getDocumentRoot(nodeHandle) instead.
      Returns:
        int Node handle of document, or DTM.NULL if a shared DTM can not tell us which Document is currently active.

    - #### getOwnerDocument

          int getOwnerDocument(int nodeHandle)

      Given a node handle, find the owning document node. This version mimics the behavior of the DOM call by the same name.
      Parameters:
        `nodeHandle` - the id of the node.
      Returns:
        int Node handle of owning document, or DTM.NULL if the node was a Document.
      See Also:
        `getDocumentRoot(int nodeHandle)`

    - #### getDocumentRoot

          int getDocumentRoot(int nodeHandle)

      Given a node handle, find the owning document node.
      Parameters:
        `nodeHandle` - the id of the node.
      Returns:
        int Node handle of owning document, or the node itself if it was a Document. (Note difference from DOM, where getOwnerDocument returns null for the Document node.)
      See Also:
        `getOwnerDocument(int nodeHandle)`

    - #### getStringValue

          XMLString getStringValue(int nodeHandle)

      Get the string-value of a node as a String object (see http://www.w3.org/TR/xpath#data-model for the definition of a node's string-value).
      Parameters:
        `nodeHandle` - The node ID.
      Returns:
        A string object that represents the string-value of the given node.

    - #### getStringValueChunkCount

          int getStringValueChunkCount(int nodeHandle)

      Get number of character array chunks in the string-value of a node. (see http://www.w3.org/TR/xpath#data-model for the definition of a node's string-value). Note that a single text node may have multiple text chunks.
      Parameters:
        `nodeHandle` - The node ID.
      Returns:
        number of character array chunks in the string-value of a node.

    - #### getStringValueChunk

          char[] getStringValueChunk(int nodeHandle,
                                   int chunkIndex,
                                   int[] startAndLen)

      Get a character array chunk in the string-value of a node. (see http://www.w3.org/TR/xpath#data-model for the definition of a node's string-value). Note that a single text node may have multiple text chunks.
      Parameters:
        `nodeHandle` - The node ID.
        `chunkIndex` - Which chunk to get.
        `startAndLen` - A two-integer array which, upon return, WILL BE FILLED with values representing the chunk's start position within the returned character buffer and the length of the chunk.
      Returns:
        The character array buffer within which the chunk occurs, setting startAndLen's contents as a side-effect.

    - #### getExpandedTypeID

          int getExpandedTypeID(int nodeHandle)

      Given a node handle, return an ID that represents the node's expanded name.
      Parameters:
        `nodeHandle` - The handle to the node in question.
      Returns:
        the expanded-name id of the node.

    - #### getExpandedTypeID

          int getExpandedTypeID(java.lang.String namespace,
                              java.lang.String localName,
                              int type)

      Given an expanded name, return an ID. If the expanded-name does not exist in the internal tables, the entry will be created, and the ID will be returned. Any additional nodes that are created that have this expanded name will use this ID. NEEDSDOC @param namespace NEEDSDOC @param localName NEEDSDOC @param type
      Returns:
        the expanded-name id of the node.

    - #### getLocalNameFromExpandedNameID

          java.lang.String getLocalNameFromExpandedNameID(int ExpandedNameID)

      Given an expanded-name ID, return the local name part.
      Parameters:
        `ExpandedNameID` - an ID that represents an expanded-name.
      Returns:
        String Local name of this node.

    - #### getNamespaceFromExpandedNameID

          java.lang.String getNamespaceFromExpandedNameID(int ExpandedNameID)

      Given an expanded-name ID, return the namespace URI part.
      Parameters:
        `ExpandedNameID` - an ID that represents an expanded-name.
      Returns:
        String URI value of this node's namespace, or null if no namespace was resolved.

    - #### getNodeName

          java.lang.String getNodeName(int nodeHandle)

      Given a node handle, return its DOM-style node name. This will include names such as #text or #document.
      Parameters:
        `nodeHandle` - the id of the node.
      Returns:
        String Name of this node, which may be an empty string. %REVIEW% Document when empty string is possible...

    - #### getNodeNameX

          java.lang.String getNodeNameX(int nodeHandle)

      Given a node handle, return the XPath node name. This should be the name as described by the XPath data model, NOT the DOM-style name.
      Parameters:
        `nodeHandle` - the id of the node.
      Returns:
        String Name of this node.

    - #### getLocalName

          java.lang.String getLocalName(int nodeHandle)

      Given a node handle, return its DOM-style localname. (As defined in Namespaces, this is the portion of the name after the prefix, if present, or the whole node name if no prefix exists)
      Parameters:
        `nodeHandle` - the id of the node.
      Returns:
        String Local name of this node.

    - #### getPrefix

          java.lang.String getPrefix(int nodeHandle)

      Given a namespace handle, return the prefix that the namespace decl is mapping. Given a node handle, return the prefix used to map to the namespace. (As defined in Namespaces, this is the portion of the name before any colon character).

      %REVIEW% Are you sure you want "" for no prefix?

      Parameters:
        `nodeHandle` - the id of the node.
      Returns:
        String prefix of this node's name, or "" if no explicit namespace prefix was given.

    - #### getNamespaceURI

          java.lang.String getNamespaceURI(int nodeHandle)

      Given a node handle, return its DOM-style namespace URI (As defined in Namespaces, this is the declared URI which this node's prefix -- or default in lieu thereof -- was mapped to.)
      Parameters:
        `nodeHandle` - the id of the node.
      Returns:
        String URI value of this node's namespace, or null if no namespace was resolved.

    - #### getNodeValue

          java.lang.String getNodeValue(int nodeHandle)

      Given a node handle, return its node value. This is mostly as defined by the DOM, but may ignore some conveniences.

      Parameters:
        `nodeHandle` - The node id.
      Returns:
        String Value of this node, or null if not meaningful for this node type.

    - #### getNodeType

          short getNodeType(int nodeHandle)

      Given a node handle, return its DOM-style node type.

      %REVIEW% Generally, returning short is false economy. Return int?

      Parameters:
        `nodeHandle` - The node id.
      Returns:
        int Node type, as per the DOM's Node._NODE constants.

    - #### getLevel

          short getLevel(int nodeHandle)

      Get the depth level of this node in the tree (equals 1 for a parentless node).
      Parameters:
        `nodeHandle` - The node id.
      Returns:
        the number of ancestors, plus one
      Usage:
        **For internal use only**

    - #### isSupported

          boolean isSupported(java.lang.String feature,
                            java.lang.String version)

      Tests whether DTM DOM implementation implements a specific feature and that feature is supported by this node.
      Parameters:
        `feature` - The name of the feature to test.
        `version` - This is the version number of the feature to test. If the version is not specified, supporting any version of the feature will cause the method to return `true`.
      Returns:
        Returns `true` if the specified feature is supported on this node, `false` otherwise.

    - #### getDocumentBaseURI

          java.lang.String getDocumentBaseURI()

      Return the base URI of the document entity. If it is not known (because the document was parsed from a socket connection or from standard input, for example), the value of this property is unknown.
      Returns:
        the document base URI String object or null if unknown.

    - #### setDocumentBaseURI

          void setDocumentBaseURI(java.lang.String baseURI)

      Set the base URI of the document entity.
      Parameters:
        `baseURI` - the document base URI String object or null if unknown.

    - #### getDocumentSystemIdentifier

          java.lang.String getDocumentSystemIdentifier(int nodeHandle)

      Return the system identifier of the document entity. If it is not known, the value of this property is null.
      Parameters:
        `nodeHandle` - The node id, which can be any valid node handle.
      Returns:
        the system identifier String object or null if unknown.

    - #### getDocumentEncoding

          java.lang.String getDocumentEncoding(int nodeHandle)

      Return the name of the character encoding scheme in which the document entity is expressed.
      Parameters:
        `nodeHandle` - The node id, which can be any valid node handle.
      Returns:
        the document encoding String object.

    - #### getDocumentStandalone

          java.lang.String getDocumentStandalone(int nodeHandle)

      Return an indication of the standalone status of the document, either "yes" or "no". This property is derived from the optional standalone document declaration in the XML declaration at the beginning of the document entity, and has no value if there is no standalone document declaration.
      Parameters:
        `nodeHandle` - The node id, which can be any valid node handle.
      Returns:
        the document standalone String object, either "yes", "no", or null.

    - #### getDocumentVersion

          java.lang.String getDocumentVersion(int documentHandle)

      Return a string representing the XML version of the document. This property is derived from the XML declaration optionally present at the beginning of the document entity, and has no value if there is no XML declaration.
      Parameters:
        `documentHandle` - the document handle
      Returns:
        the document version String object

    - #### getDocumentAllDeclarationsProcessed

          boolean getDocumentAllDeclarationsProcessed()

      Return an indication of whether the processor has read the complete DTD. Its value is a boolean. If it is false, then certain properties (indicated in their descriptions below) may be unknown. If it is true, those properties are never unknown.
      Returns:
        `true` if all declarations were processed; `false` otherwise.

    - #### getDocumentTypeDeclarationSystemIdentifier

          java.lang.String getDocumentTypeDeclarationSystemIdentifier()

      A document type declaration information item has the following properties: 1. [system identifier] The system identifier of the external subset, if it exists. Otherwise this property has no value.
      Returns:
        the system identifier String object, or null if there is none.

    - #### getDocumentTypeDeclarationPublicIdentifier

          java.lang.String getDocumentTypeDeclarationPublicIdentifier()

      Return the public identifier of the external subset, normalized as described in 4.2.2 External Entities [XML]. If there is no external subset or if it has no public identifier, this property has no value.
      Returns:
        the public identifier String object, or null if there is none.

    - #### getElementById

          int getElementById(java.lang.String elementId)

      Returns the `Element` whose `ID` is given by `elementId`. If no such element exists, returns `DTM.NULL`. Behavior is not defined if more than one element has this `ID`. Attributes (including those with the name "ID") are not of type ID unless so defined by DTD/Schema information available to the DTM implementation. Implementations that do not know whether attributes are of type ID or not are expected to return `DTM.NULL`.

      %REVIEW% Presumably IDs are still scoped to a single document, and this operation searches only within a single document, right? Wouldn't want collisions between DTMs in the same process.

      Parameters:
        `elementId` - The unique `id` value for an element.
      Returns:
        The handle of the matching element.

    - #### getUnparsedEntityURI

          java.lang.String getUnparsedEntityURI(java.lang.String name)

      The getUnparsedEntityURI function returns the URI of the unparsed entity with the specified name in the same document as the context node (see [3.3 Unparsed Entities]). It returns the empty string if there is no such entity.

      XML processors may choose to use the System Identifier (if one is provided) to resolve the entity, rather than the URI in the Public Identifier. The details are dependent on the processor, and we would have to support some form of plug-in resolver to handle this properly. Currently, we simply return the System Identifier if present, and hope that it a usable URI or that our caller can map it to one. %REVIEW% Resolve Public Identifiers... or consider changing function name.

      If we find a relative URI reference, XML expects it to be resolved in terms of the base URI of the document. The DOM doesn't do that for us, and it isn't entirely clear whether that should be done here; currently that's pushed up to a higher level of our application. (Note that DOM Level 1 didn't store the document's base URI.) %REVIEW% Consider resolving Relative URIs.

      (The DOM's statement that "An XML processor may choose to completely expand entities before the structure model is passed to the DOM" refers only to parsed entities, not unparsed, and hence doesn't affect this function.)

      Parameters:
        `name` - A string containing the Entity Name of the unparsed entity.
      Returns:
        String containing the URI of the Unparsed Entity, or an empty string if no such entity exists.

    - #### supportsPreStripping

          boolean supportsPreStripping()

      Return true if the xsl:strip-space or xsl:preserve-space was processed during construction of the document contained in this DTM. NEEDSDOC ($objectName$) @return

    - #### isNodeAfter

          boolean isNodeAfter(int firstNodeHandle,
                            int secondNodeHandle)

      Figure out whether nodeHandle2 should be considered as being later in the document than nodeHandle1, in Document Order as defined by the XPath model. This may not agree with the ordering defined by other XML applications.

      There are some cases where ordering isn't defined, and neither are the results of this function -- though we'll generally return true.

      %REVIEW% Make sure this does the right thing with attribute nodes!!!

      %REVIEW% Consider renaming for clarity. Perhaps isDocumentOrder(a,b)?

      Parameters:
        `firstNodeHandle` - DOM Node to perform position comparison on.
        `secondNodeHandle` - DOM Node to perform position comparison on.
      Returns:
        false if secondNode comes before firstNode, otherwise return true. You can think of this as `(firstNode.documentOrderPosition <= secondNode.documentOrderPosition)`.

    - #### isCharacterElementContentWhitespace

          boolean isCharacterElementContentWhitespace(int nodeHandle)

      2. [element content whitespace] A boolean indicating whether a text node represents white space appearing within element content (see [XML], 2.10 "White Space Handling"). Note that validating XML processors are required by XML 1.0 to provide this information... but that DOM Level 2 did not support it, since it depends on knowledge of the DTD which DOM2 could not guarantee would be available.

      If there is no declaration for the containing element, an XML processor must assume that the whitespace could be meaningful and return false. If no declaration has been read, but the [all declarations processed] property of the document information item is false (so there may be an unread declaration), then the value of this property is indeterminate for white space characters and should probably be reported as false. It is always false for text nodes that contain anything other than (or in addition to) white space.

      Note too that it always returns false for non-Text nodes.

      %REVIEW% Joe wants to rename this isWhitespaceInElementContent() for clarity

      Parameters:
        `nodeHandle` - the node ID.
      Returns:
        `true` if the node definitely represents whitespace in element content; `false` otherwise.

    - #### isDocumentAllDeclarationsProcessed

          boolean isDocumentAllDeclarationsProcessed(int documentHandle)

      10. [all declarations processed] This property is not strictly speaking part of the infoset of the document. Rather it is an indication of whether the processor has read the complete DTD. Its value is a boolean. If it is false, then certain properties (indicated in their descriptions below) may be unknown. If it is true, those properties are never unknown.
      Parameters:
        `documentHandle` - A node handle that must identify a document.
      Returns:
        `true` if all declarations were processed; `false` otherwise.

    - #### isAttributeSpecified

          boolean isAttributeSpecified(int attributeHandle)

      5. [specified] A flag indicating whether this attribute was actually specified in the start-tag of its element, or was defaulted from the DTD (or schema).
      Parameters:
        `attributeHandle` - The attribute handle
      Returns:
        `true` if the attribute was specified; `false` if it was defaulted or the handle doesn't refer to an attribute node.

    - #### dispatchCharactersEvents

          void dispatchCharactersEvents(int nodeHandle,
                                      ContentHandler ch,
                                      boolean normalize)
                                        throws SAXException

      Directly call the characters method on the passed ContentHandler for the string-value of the given node (see http://www.w3.org/TR/xpath#data-model for the definition of a node's string-value). Multiple calls to the ContentHandler's characters methods may well occur for a single call to this method.
      Parameters:
        `nodeHandle` - The node ID.
        `ch` - A non-null reference to a ContentHandler.
        `normalize` - true if the content should be normalized according to the rules for the XPath normalize-space function.
      Throws:
        `SAXException`

    - #### dispatchToEvents

          void dispatchToEvents(int nodeHandle,
                              ContentHandler ch)
                                throws SAXException

      Directly create SAX parser events representing the XML content of a DTM subtree. This is a "serialize" operation.
      Parameters:
        `nodeHandle` - The node ID.
        `ch` - A non-null reference to a ContentHandler.
      Throws:
        `SAXException`

    - #### getNode

          Node getNode(int nodeHandle)

      Return an DOM node for the given node.
      Parameters:
        `nodeHandle` - The node ID.
      Returns:
        A node representation of the DTM node.

    - #### needsTwoThreads

          boolean needsTwoThreads()

      Returns:
        true iff we're building this model incrementally (eg we're partnered with a CoroutineParser) and thus require that the transformation and the parse run simultaneously. Guidance to the DTMManager.

    - #### getContentHandler

          ContentHandler getContentHandler()

      Return this DTM's content handler, if it has one.
      Returns:
        null if this model doesn't respond to SAX events.

    - #### getLexicalHandler

          LexicalHandler getLexicalHandler()

      Return this DTM's lexical handler, if it has one. %REVIEW% Should this return null if constrution already done/begun?
      Returns:
        null if this model doesn't respond to lexical SAX events.

    - #### getEntityResolver

          EntityResolver getEntityResolver()

      Return this DTM's EntityResolver, if it has one.
      Returns:
        null if this model doesn't respond to SAX entity ref events.

    - #### getDTDHandler

          DTDHandler getDTDHandler()

      Return this DTM's DTDHandler, if it has one.
      Returns:
        null if this model doesn't respond to SAX dtd events.

    - #### getErrorHandler

          ErrorHandler getErrorHandler()

      Return this DTM's ErrorHandler, if it has one.
      Returns:
        null if this model doesn't respond to SAX error events.

    - #### getDeclHandler

          DeclHandler getDeclHandler()

      Return this DTM's DeclHandler, if it has one.
      Returns:
        null if this model doesn't respond to SAX Decl events.

    - #### appendChild

          void appendChild(int newChild,
                         boolean clone,
                         boolean cloneDepth)

      Append a child to "the end of the document". Please note that the node is always cloned in a base DTM, since our basic behavior is immutable so nodes can't be removed from their previous location.

      %REVIEW% DTM maintains an insertion cursor which performs a depth-first tree walk as nodes come in, and this operation is really equivalent to: insertionCursor.appendChild(document.importNode(newChild))) where the insert point is the last element that was appended (or the last one popped back to by an end-element operation).

      Parameters:
        `newChild` - Must be a valid new node handle.
        `clone` - true if the child should be cloned into the document.
        `cloneDepth` - if the clone argument is true, specifies that the clone should include all it's children.

    - #### appendTextChild

          void appendTextChild(java.lang.String str)

      Append a text node child that will be constructed from a string, to the end of the document. Behavior is otherwise like appendChild().
      Parameters:
        `str` - Non-null reference to a string.

    - #### getSourceLocatorFor

          SourceLocator getSourceLocatorFor(int node)

      Get the location of a node in the source document.
      Parameters:
        `node` - an `int` value
      Returns:
        a `SourceLocator` value or null if no location is available

    - #### documentRegistration

          void documentRegistration()

      As the DTM is registered with the DTMManager, this method will be called. This will give the DTM implementation a chance to initialize any subsystems that are required to build the DTM

    - #### documentRelease

          void documentRelease()

      As documents are released from the DTMManager, the DTM implementation will be notified of the event. This will allow the DTM implementation to shutdown any subsystem activity that may of been assoiated with the active DTM Implementation.

    - #### migrateTo

          void migrateTo(DTMManager manager)

      Migrate a DTM built with an old DTMManager to a new DTMManager. After the migration, the new DTMManager will treat the DTM as one that is built by itself. This is used to support DTM sharing between multiple transformations.
      Parameters:
        `manager` - the DTMManager

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