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## org.apache.xml.dtm.ref.sax2dtm
Class SAX2DTM

    java.lang.Object
      |
      +--org.apache.xml.dtm.ref.DTMDefaultBase
            |
            +--org.apache.xml.dtm.ref.DTMDefaultBaseTraversers
                  |
                  +--org.apache.xml.dtm.ref.DTMDefaultBaseIterators
                        |
                        +--org.apache.xml.dtm.ref.sax2dtm.SAX2DTM

Direct Known Subclasses:
  SAX2DTM2, SAX2RTFDTM

public class SAX2DTM
extends DTMDefaultBaseIterators
implements EntityResolver, DTDHandler, ContentHandler, ErrorHandler, DeclHandler, LexicalHandler

This class implements a DTM that tends to be optimized more for speed than for compactness, that is constructed via SAX2 ContentHandler events.

Inner classes inherited from class org.apache.xml.dtm.ref.DTMDefaultBaseIterators
`DTMDefaultBaseIterators.AncestorIterator, DTMDefaultBaseIterators.AttributeIterator, DTMDefaultBaseIterators.ChildrenIterator, DTMDefaultBaseIterators.DescendantIterator, DTMDefaultBaseIterators.FollowingIterator, DTMDefaultBaseIterators.FollowingSiblingIterator, DTMDefaultBaseIterators.InternalAxisIteratorBase, DTMDefaultBaseIterators.NamespaceAttributeIterator, DTMDefaultBaseIterators.NamespaceChildrenIterator, DTMDefaultBaseIterators.NamespaceIterator, DTMDefaultBaseIterators.NthDescendantIterator, DTMDefaultBaseIterators.ParentIterator, DTMDefaultBaseIterators.PrecedingIterator, DTMDefaultBaseIterators.PrecedingSiblingIterator, DTMDefaultBaseIterators.RootIterator, DTMDefaultBaseIterators.SingletonIterator, DTMDefaultBaseIterators.TypedAncestorIterator, DTMDefaultBaseIterators.TypedAttributeIterator, DTMDefaultBaseIterators.TypedChildrenIterator, DTMDefaultBaseIterators.TypedDescendantIterator, DTMDefaultBaseIterators.TypedFollowingIterator, DTMDefaultBaseIterators.TypedFollowingSiblingIterator, DTMDefaultBaseIterators.TypedNamespaceIterator, DTMDefaultBaseIterators.TypedPrecedingIterator, DTMDefaultBaseIterators.TypedPrecedingSiblingIterator, DTMDefaultBaseIterators.TypedRootIterator, DTMDefaultBaseIterators.TypedSingletonIterator`

Fields inherited from class org.apache.xml.dtm.ref.DTMDefaultBase
`DEFAULT_BLOCKSIZE, DEFAULT_NUMBLOCKS, DEFAULT_NUMBLOCKS_SMALL, m_mgr, ROOTNODE`

Constructor Summary
`SAX2DTM(DTMManager mgr, Source source, int dtmIdentity, DTMWSFilter whiteSpaceFilter, XMLStringFactory xstringfactory, boolean doIndexing)` Construct a SAX2DTM object using the default block size.
`SAX2DTM(DTMManager mgr, Source source, int dtmIdentity, DTMWSFilter whiteSpaceFilter, XMLStringFactory xstringfactory, boolean doIndexing, int blocksize, boolean usePrevsib, boolean newNameTable)` Construct a SAX2DTM object ready to be constructed from SAX2 ContentHandler events.

Method Summary
`void` | `attributeDecl(java.lang.String eName, java.lang.String aName, java.lang.String type, java.lang.String valueDefault, java.lang.String value)` Report an attribute type declaration.
`void` | `characters(char[] ch, int start, int length)` Receive notification of character data inside an element.
`void` | `clearCoRoutine()` Ask the CoRoutine parser to doTerminate and clear the reference.
`void` | `clearCoRoutine(boolean callDoTerminate)` Ask the CoRoutine parser to doTerminate and clear the reference.
`void` | `comment(char[] ch, int start, int length)` Report an XML comment anywhere in 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 from a subtree.
`void` | `elementDecl(java.lang.String name, java.lang.String model)` Report an element type declaration.
`void` | `endCDATA()` Report the end of a CDATA section.
`void` | `endDocument()` Receive notification of the end of the document.
`void` | `endDTD()` Report the end of DTD declarations.
`void` | `endElement(java.lang.String uri, java.lang.String localName, java.lang.String qName)` Receive notification of the end of an element.
`void` | `endEntity(java.lang.String name)` Report the end of an entity.
`void` | `endPrefixMapping(java.lang.String prefix)` Receive notification of the end of a Namespace mapping.
`void` | `error(SAXParseException e)` Receive notification of a recoverable parser error.
`void` | `externalEntityDecl(java.lang.String name, java.lang.String publicId, java.lang.String systemId)` Report a parsed external entity declaration.
`void` | `fatalError(SAXParseException e)` Report a fatal XML parsing error.
`int` | `getAttributeNode(int nodeHandle, java.lang.String namespaceURI, java.lang.String name)` Retrieves an attribute node by by qualified name and namespace URI.
`ContentHandler` | `getContentHandler()` getContentHandler returns "our SAX builder" -- the thing that someone else should send SAX events to in order to extend this DTM model.
`DeclHandler` | `getDeclHandler()` Return this DTM's DeclHandler.
`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.
`DTDHandler` | `getDTDHandler()` Return this DTM's DTDHandler.
`int` | `getElementById(java.lang.String elementId)` Returns the `Element` whose `ID` is given by `elementId`.
`EntityResolver` | `getEntityResolver()` Return this DTM's EntityResolver.
`ErrorHandler` | `getErrorHandler()` Return this DTM's ErrorHandler.
`java.lang.String` | `getFixedNames(int type)`
`int` | `getIdForNamespace(java.lang.String uri)` Get a prefix either from the uri mapping, or just make one up!
`LexicalHandler` | `getLexicalHandler()` Return this DTM's lexical handler.
`java.lang.String` | `getLocalName(int nodeHandle)` Given a node handle, return its XPath-style localname.
`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.)
`java.lang.String` | `getNamespaceURI(java.lang.String prefix)` Get a prefix either from the qname or from the uri mapping, or just make one up!
`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.
`java.lang.String` | `getNodeValue(int nodeHandle)` Given a node handle, return its node value.
`int` | `getNumberOfNodes()` Get the number of nodes that have been added.
`java.lang.String` | `getPrefix(int nodeHandle)` Given a namespace handle, return the prefix that the namespace decl is mapping.
`java.lang.String` | `getPrefix(java.lang.String qname, java.lang.String uri)` Get a prefix either from the qname or from the uri mapping, or just make one up!
`SourceLocator` | `getSourceLocatorFor(int node)` Retrieve the SourceLocator associated with a specific node.
`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).
`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]).
`void` | `ignorableWhitespace(char[] ch, int start, int length)` Receive notification of ignorable whitespace in element content.
`void` | `internalEntityDecl(java.lang.String name, java.lang.String value)` Report an internal entity declaration.
`boolean` | `isAttributeSpecified(int attributeHandle)` 5.
`boolean` | `isWhitespace(int nodeHandle)` Determine if the string-value of a node is whitespace
`void` | `migrateTo(DTMManager manager)` Migrate a DTM built with an old DTMManager to a new DTMManager.
`boolean` | `needsTwoThreads()`
`void` | `notationDecl(java.lang.String name, java.lang.String publicId, java.lang.String systemId)` Receive notification of a notation declaration.
`void` | `processingInstruction(java.lang.String target, java.lang.String data)` Receive notification of a processing instruction.
`InputSource` | `resolveEntity(java.lang.String publicId, java.lang.String systemId)` Resolve an external entity.
`void` | `setDocumentLocator(Locator locator)` Receive a Locator object for document events.
`void` | `setIDAttribute(java.lang.String id, int elem)` Set an ID string to node association in the ID table.
`void` | `setIncrementalSAXSource(IncrementalSAXSource incrementalSAXSource)` Bind a IncrementalSAXSource to this DTM.
`void` | `setProperty(java.lang.String property, java.lang.Object value)` Set a run time property for this DTM instance.
`void` | `setUseSourceLocation(boolean useSourceLocation)` Set whether information about document source location should be maintained or not.
`void` | `skippedEntity(java.lang.String name)` Receive notification of a skipped entity.
`void` | `startCDATA()` Report the start of a CDATA section.
`void` | `startDocument()` Receive notification of the beginning of the document.
`void` | `startDTD(java.lang.String name, java.lang.String publicId, java.lang.String systemId)` Report the start of DTD declarations, if any.
`void` | `startElement(java.lang.String uri, java.lang.String localName, java.lang.String qName, Attributes attributes)` Receive notification of the start of an element.
`void` | `startEntity(java.lang.String name)` Report the beginning of an entity in content.
`void` | `startPrefixMapping(java.lang.String prefix, java.lang.String uri)` Receive notification of the start of a Namespace mapping.
`void` | `unparsedEntityDecl(java.lang.String name, java.lang.String publicId, java.lang.String systemId, java.lang.String notationName)` Receive notification of an unparsed entity declaration.
`void` | `warning(SAXParseException e)` Receive notification of a parser warning.

Methods inherited from class org.apache.xml.dtm.ref.DTMDefaultBaseIterators
`getAxisIterator, getTypedAxisIterator`

Methods inherited from class org.apache.xml.dtm.ref.DTMDefaultBaseTraversers
`getAxisTraverser`

Methods inherited from class org.apache.xml.dtm.ref.DTMDefaultBase
`appendChild, appendTextChild, documentRegistration, documentRelease, dumpDTM, dumpNode, getDocument, getDocumentAllDeclarationsProcessed, getDocumentBaseURI, getDocumentEncoding, getDocumentRoot, getDocumentStandalone, getDocumentSystemIdentifier, getDocumentVersion, getDTMIDs, getExpandedTypeID, getExpandedTypeID, getFirstAttribute, getFirstChild, getFirstNamespaceNode, getLastChild, getLevel, getLocalNameFromExpandedNameID, getManager, getNamespaceFromExpandedNameID, getNamespaceType, getNextAttribute, getNextNamespaceNode, getNextSibling, getNode, getNodeHandle, getNodeIdent, getNodeType, getOwnerDocument, getParent, getPreviousSibling, getStringValueChunk, getStringValueChunkCount, getTypedFirstChild, getTypedNextSibling, hasChildNodes, isCharacterElementContentWhitespace, isDocumentAllDeclarationsProcessed, isNodeAfter, isSupported, makeNodeHandle, makeNodeIdentity, setDocumentBaseURI, setFeature, supportsPreStripping`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### SAX2DTM

    public SAX2DTM(DTMManager mgr,
                   Source source,
                   int dtmIdentity,
                   DTMWSFilter whiteSpaceFilter,
                   XMLStringFactory xstringfactory,
                   boolean doIndexing)

  Construct a SAX2DTM object using the default block size.
  Parameters:
    `mgr` - The DTMManager who owns this DTM.
    `source` - the JAXP 1.1 Source object for this DTM.
    `dtmIdentity` - The DTM identity ID for this DTM.
    `whiteSpaceFilter` - The white space filter for this DTM, which may be null.
    `xstringfactory` - XMLString factory for creating character content.
    `doIndexing` - true if the caller considers it worth it to use indexing schemes.

### SAX2DTM

    public SAX2DTM(DTMManager mgr,
                   Source source,
                   int dtmIdentity,
                   DTMWSFilter whiteSpaceFilter,
                   XMLStringFactory xstringfactory,
                   boolean doIndexing,
                   int blocksize,
                   boolean usePrevsib,
                   boolean newNameTable)

  Construct a SAX2DTM object ready to be constructed from SAX2 ContentHandler events.
  Parameters:
    `mgr` - The DTMManager who owns this DTM.
    `source` - the JAXP 1.1 Source object for this DTM.
    `dtmIdentity` - The DTM identity ID for this DTM.
    `whiteSpaceFilter` - The white space filter for this DTM, which may be null.
    `xstringfactory` - XMLString factory for creating character content.
    `doIndexing` - true if the caller considers it worth it to use indexing schemes.
    `blocksize` - The block size of the DTM.
    `usePrevsib` - true if we want to build the previous sibling node array.
    `newNameTable` - true if we want to use a new ExpandedNameTable for this DTM.

Method Detail

### setUseSourceLocation

    public void setUseSourceLocation(boolean useSourceLocation)

  Set whether information about document source location should be maintained or not.

### clearCoRoutine

    public void clearCoRoutine()

  Ask the CoRoutine parser to doTerminate and clear the reference.

### clearCoRoutine

    public void clearCoRoutine(boolean callDoTerminate)

  Ask the CoRoutine parser to doTerminate and clear the reference. If the CoRoutine parser has already been cleared, this will have no effect.
  Parameters:
    `callDoTerminate` - true of doTerminate should be called on the coRoutine parser.

### setIncrementalSAXSource

    public void setIncrementalSAXSource(IncrementalSAXSource incrementalSAXSource)

  Bind a IncrementalSAXSource to this DTM. If we discover we need nodes that have not yet been built, we will ask this object to send us more events, and it will manage interactions with its data sources. Note that we do not actually build the IncrementalSAXSource, since we don't know what source it's reading from, what thread that source will run in, or when it will run.
  Parameters:
    `incrementalSAXSource` - The parser that we want to recieve events from on demand.

### getContentHandler

    public ContentHandler getContentHandler()

  getContentHandler returns "our SAX builder" -- the thing that someone else should send SAX events to in order to extend this DTM model. %REVIEW% Should this return null if constrution already done/begun?
  Returns:
    null if this model doesn't respond to SAX events, "this" if the DTM object has a built-in SAX ContentHandler, the IncrementalSAXSource if we're bound to one and should receive the SAX stream via it for incremental build purposes...

### getLexicalHandler

    public LexicalHandler getLexicalHandler()

  Return this DTM's lexical handler. %REVIEW% Should this return null if constrution already done/begun?
  Returns:
    null if this model doesn't respond to lexical SAX events, "this" if the DTM object has a built-in SAX ContentHandler, the IncrementalSAXSource if we're bound to one and should receive the SAX stream via it for incremental build purposes...

### getEntityResolver

    public EntityResolver getEntityResolver()

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

### getDTDHandler

    public DTDHandler getDTDHandler()

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

### getErrorHandler

    public ErrorHandler getErrorHandler()

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

### getDeclHandler

    public DeclHandler getDeclHandler()

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

### needsTwoThreads

    public boolean needsTwoThreads()

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

### dispatchCharactersEvents

    public 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 -
  Overrides:
    dispatchCharactersEvents in class DTMDefaultBase

### getNodeName

    public 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... %REVIEW-COMMENT% It should never be empty, should it?
  Overrides:
    getNodeName in class DTMDefaultBase

### getNodeNameX

    public 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, which may be an empty string.
  Overrides:
    getNodeNameX in class DTMDefaultBase

### isAttributeSpecified

    public 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.
  Parameters:
    `attributeHandle` - Must be a valid handle to an attribute node.
  Returns:
    `true` if the attribute was specified; `false` if it was defaulted.
  Overrides:
    isAttributeSpecified in class DTMDefaultBase

### getDocumentTypeDeclarationSystemIdentifier

    public 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.
  Overrides:
    getDocumentTypeDeclarationSystemIdentifier in class DTMDefaultBase

### dispatchToEvents

    public void dispatchToEvents(int nodeHandle,
                                 ContentHandler ch)
                          throws SAXException

  Directly create SAX parser events from a subtree.
  Parameters:
    `nodeHandle` - The node ID.
    `ch` - A non-null reference to a ContentHandler.
  Throws:
    SAXException -
  Overrides:
    dispatchToEvents in class DTMDefaultBase

### getNumberOfNodes

    public int getNumberOfNodes()

  Get the number of nodes that have been added.
  Returns:
    The number of that are currently in the tree.

### migrateTo

    public 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
  Overrides:
    migrateTo in class DTMDefaultBase

### getNodeValue

    public 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.
  Overrides:
    getNodeValue in class DTMDefaultBase

### getLocalName

    public java.lang.String getLocalName(int nodeHandle)

  Given a node handle, return its XPath-style localname. (As defined in Namespaces, this is the portion of the name after any colon character).
  Parameters:
    `nodeHandle` - the id of the node.
  Returns:
    String Local name of this node.
  Overrides:
    getLocalName in class DTMDefaultBase

### getUnparsedEntityURI

    public 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. TODO: 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.) TODO: 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.
  Overrides:
    getUnparsedEntityURI in class DTMDefaultBase

### getPrefix

    public 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.

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

  %REVIEW-COMMENT% I think so... not totally sure. -sb

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

### getAttributeNode

    public int getAttributeNode(int nodeHandle,
                                java.lang.String namespaceURI,
                                java.lang.String name)

  Retrieves an attribute node by by qualified name and namespace URI.
  Parameters:
    `nodeHandle` - int 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.
  Overrides:
    getAttributeNode in class DTMDefaultBase

### getDocumentTypeDeclarationPublicIdentifier

    public 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.
  Overrides:
    getDocumentTypeDeclarationPublicIdentifier in class DTMDefaultBase

### getNamespaceURI

    public 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.)

  %REVIEW% Null or ""? -sb

  Parameters:
    `nodeHandle` - the id of the node.
  Returns:
    String URI value of this node's namespace, or null if no namespace was resolved.
  Overrides:
    getNamespaceURI in class DTMDefaultBase

### getStringValue

    public 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.
  Overrides:
    getStringValue in class DTMDefaultBase

### isWhitespace

    public boolean isWhitespace(int nodeHandle)

  Determine if the string-value of a node is whitespace
  Parameters:
    `nodeHandle` - The node Handle.
  Returns:
    Return true if the given node is whitespace.

### getElementById

    public 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.
  Overrides:
    getElementById in class DTMDefaultBase

### getPrefix

    public java.lang.String getPrefix(java.lang.String qname,
                                      java.lang.String uri)

  Get a prefix either from the qname or from the uri mapping, or just make one up!
  Parameters:
    `qname` - The qualified name, which may be null.
    `uri` - The namespace URI, which may be null.
  Returns:
    The prefix if there is one, or null.

### getIdForNamespace

    public int getIdForNamespace(java.lang.String uri)

  Get a prefix either from the uri mapping, or just make one up!
  Parameters:
    `uri` - The namespace URI, which may be null.
  Returns:
    The prefix if there is one, or null.

### getNamespaceURI

    public java.lang.String getNamespaceURI(java.lang.String prefix)

  Get a prefix either from the qname or from the uri mapping, or just make one up!
  Returns:
    The prefix if there is one, or null.

### setIDAttribute

    public void setIDAttribute(java.lang.String id,
                               int elem)

  Set an ID string to node association in the ID table.
  Parameters:
    `id` - The ID string.
    `elem` - The associated element handle.

### resolveEntity

    public InputSource resolveEntity(java.lang.String publicId,
                                     java.lang.String systemId)
                              throws SAXException

  Resolve an external entity.

  Always return null, so that the parser will use the system identifier provided in the XML document. This method implements the SAX default behaviour: application writers can override it in a subclass to do special translations such as catalog lookups or URI redirection.

  Specified by:
    resolveEntity in interface EntityResolver
  Parameters:
    `publicId` - The public identifer, or null if none is available.
    `systemId` - The system identifier provided in the XML document.
  Returns:
    The new input source, or null to require the default behaviour.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
    SAXException -
  See Also:
    `EntityResolver.resolveEntity(java.lang.String, java.lang.String)`

### notationDecl

    public void notationDecl(java.lang.String name,
                             java.lang.String publicId,
                             java.lang.String systemId)
                      throws SAXException

  Receive notification of a notation declaration.

  By default, do nothing. Application writers may override this method in a subclass if they wish to keep track of the notations declared in a document.

  Specified by:
    notationDecl in interface DTDHandler
  Parameters:
    `name` - The notation name.
    `publicId` - The notation public identifier, or null if not available.
    `systemId` - The notation system identifier.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
    SAXException -
  See Also:
    `DTDHandler.notationDecl(java.lang.String, java.lang.String, java.lang.String)`

### unparsedEntityDecl

    public void unparsedEntityDecl(java.lang.String name,
                                   java.lang.String publicId,
                                   java.lang.String systemId,
                                   java.lang.String notationName)
                            throws SAXException

  Receive notification of an unparsed entity declaration.

  By default, do nothing. Application writers may override this method in a subclass to keep track of the unparsed entities declared in a document.

  Specified by:
    unparsedEntityDecl in interface DTDHandler
  Parameters:
    `name` - The entity name.
    `publicId` - The entity public identifier, or null if not available.
    `systemId` - The entity system identifier.
    `notationName` - The name of the associated notation.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
    SAXException -
  See Also:
    `DTDHandler.unparsedEntityDecl(java.lang.String, java.lang.String, java.lang.String, java.lang.String)`

### setDocumentLocator

    public void setDocumentLocator(Locator locator)

  Receive a Locator object for document events.

  By default, do nothing. Application writers may override this method in a subclass if they wish to store the locator for use with other document events.

  Specified by:
    setDocumentLocator in interface ContentHandler
  Parameters:
    `locator` - A locator for all SAX document events.
  See Also:
    `ContentHandler.setDocumentLocator(org.xml.sax.Locator)`, `Locator`

### startDocument

    public void startDocument()
                       throws SAXException

  Receive notification of the beginning of the document.
  Specified by:
    startDocument in interface ContentHandler
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
  See Also:
    `ContentHandler.startDocument()`

### endDocument

    public void endDocument()
                     throws SAXException

  Receive notification of the end of the document.
  Specified by:
    endDocument in interface ContentHandler
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
  See Also:
    `ContentHandler.endDocument()`

### startPrefixMapping

    public void startPrefixMapping(java.lang.String prefix,
                                   java.lang.String uri)
                            throws SAXException

  Receive notification of the start of a Namespace mapping.

  By default, do nothing. Application writers may override this method in a subclass to take specific actions at the start of each Namespace prefix scope (such as storing the prefix mapping).

  Specified by:
    startPrefixMapping in interface ContentHandler
  Parameters:
    `prefix` - The Namespace prefix being declared.
    `uri` - The Namespace URI mapped to the prefix.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
  See Also:
    `ContentHandler.startPrefixMapping(java.lang.String, java.lang.String)`

### endPrefixMapping

    public void endPrefixMapping(java.lang.String prefix)
                          throws SAXException

  Receive notification of the end of a Namespace mapping.

  By default, do nothing. Application writers may override this method in a subclass to take specific actions at the end of each prefix mapping.

  Specified by:
    endPrefixMapping in interface ContentHandler
  Parameters:
    `prefix` - The Namespace prefix being declared.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
  See Also:
    `ContentHandler.endPrefixMapping(java.lang.String)`

### startElement

    public void startElement(java.lang.String uri,
                             java.lang.String localName,
                             java.lang.String qName,
                             Attributes attributes)
                      throws SAXException

  Receive notification of the start of an element.

  By default, do nothing. Application writers may override this method in a subclass to take specific actions at the start of each element (such as allocating a new tree node or writing output to a file).

  Specified by:
    startElement in interface ContentHandler
  Parameters:
    `uri` - The Namespace URI, or the empty string if the element has no Namespace URI or if Namespace processing is not being performed.
    `localName` - The local name (without prefix), or the empty string if Namespace processing is not being performed.
    `qName` - The qualified name (with prefix), or the empty string if qualified names are not available.
    `attributes` - The specified or defaulted attributes.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
  See Also:
    `ContentHandler.startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)`

### endElement

    public void endElement(java.lang.String uri,
                           java.lang.String localName,
                           java.lang.String qName)
                    throws SAXException

  Receive notification of the end of an element.

  By default, do nothing. Application writers may override this method in a subclass to take specific actions at the end of each element (such as finalising a tree node or writing output to a file).

  Specified by:
    endElement in interface ContentHandler
  Parameters:
    `uri` - The Namespace URI, or the empty string if the element has no Namespace URI or if Namespace processing is not being performed.
    `localName` - The local name (without prefix), or the empty string if Namespace processing is not being performed.
    `qName` - The qualified XML 1.0 name (with prefix), or the empty string if qualified names are not available.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
  See Also:
    `ContentHandler.endElement(java.lang.String, java.lang.String, java.lang.String)`

### characters

    public void characters(char[] ch,
                           int start,
                           int length)
                    throws SAXException

  Receive notification of character data inside an element.

  By default, do nothing. Application writers may override this method to take specific actions for each chunk of character data (such as adding the data to a node or buffer, or printing it to a file).

  Specified by:
    characters in interface ContentHandler
  Parameters:
    `ch` - The characters.
    `start` - The start position in the character array.
    `length` - The number of characters to use from the character array.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
  See Also:
    `ContentHandler.characters(char[], int, int)`

### ignorableWhitespace

    public void ignorableWhitespace(char[] ch,
                                    int start,
                                    int length)
                             throws SAXException

  Receive notification of ignorable whitespace in element content.

  By default, do nothing. Application writers may override this method to take specific actions for each chunk of ignorable whitespace (such as adding data to a node or buffer, or printing it to a file).

  Specified by:
    ignorableWhitespace in interface ContentHandler
  Parameters:
    `ch` - The whitespace characters.
    `start` - The start position in the character array.
    `length` - The number of characters to use from the character array.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
  See Also:
    `ContentHandler.ignorableWhitespace(char[], int, int)`

### processingInstruction

    public void processingInstruction(java.lang.String target,
                                      java.lang.String data)
                               throws SAXException

  Receive notification of a processing instruction.

  By default, do nothing. Application writers may override this method in a subclass to take specific actions for each processing instruction, such as setting status variables or invoking other methods.

  Specified by:
    processingInstruction in interface ContentHandler
  Parameters:
    `target` - The processing instruction target.
    `data` - The processing instruction data, or null if none is supplied.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
  See Also:
    `ContentHandler.processingInstruction(java.lang.String, java.lang.String)`

### skippedEntity

    public void skippedEntity(java.lang.String name)
                       throws SAXException

  Receive notification of a skipped entity.

  By default, do nothing. Application writers may override this method in a subclass to take specific actions for each processing instruction, such as setting status variables or invoking other methods.

  Specified by:
    skippedEntity in interface ContentHandler
  Parameters:
    `name` - The name of the skipped entity.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
  See Also:
    `ContentHandler.processingInstruction(java.lang.String, java.lang.String)`

### warning

    public void warning(SAXParseException e)
                 throws SAXException

  Receive notification of a parser warning.

  The default implementation does nothing. Application writers may override this method in a subclass to take specific actions for each warning, such as inserting the message in a log file or printing it to the console.

  Specified by:
    warning in interface ErrorHandler
  Parameters:
    `e` - The warning information encoded as an exception.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
  See Also:
    `ErrorHandler.warning(org.xml.sax.SAXParseException)`, `SAXParseException`

### error

    public void error(SAXParseException e)
               throws SAXException

  Receive notification of a recoverable parser error.

  The default implementation does nothing. Application writers may override this method in a subclass to take specific actions for each error, such as inserting the message in a log file or printing it to the console.

  Specified by:
    error in interface ErrorHandler
  Parameters:
    `e` - The warning information encoded as an exception.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
  See Also:
    `ErrorHandler.warning(org.xml.sax.SAXParseException)`, `SAXParseException`

### fatalError

    public void fatalError(SAXParseException e)
                    throws SAXException

  Report a fatal XML parsing error.

  The default implementation throws a SAXParseException. Application writers may override this method in a subclass if they need to take specific actions for each fatal error (such as collecting all of the errors into a single report): in any case, the application must stop all regular processing when this method is invoked, since the document is no longer reliable, and the parser may no longer report parsing events.

  Specified by:
    fatalError in interface ErrorHandler
  Parameters:
    `e` - The error information encoded as an exception.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
  See Also:
    `ErrorHandler.fatalError(org.xml.sax.SAXParseException)`, `SAXParseException`

### elementDecl

    public void elementDecl(java.lang.String name,
                            java.lang.String model)
                     throws SAXException

  Report an element type declaration.

  The content model will consist of the string "EMPTY", the string "ANY", or a parenthesised group, optionally followed by an occurrence indicator. The model will be normalized so that all whitespace is removed,and will include the enclosing parentheses.

  Specified by:
    elementDecl in interface DeclHandler
  Parameters:
    `name` - The element type name.
    `model` - The content model as a normalized string.
  Throws:
    SAXException - The application may raise an exception.

### attributeDecl

    public void attributeDecl(java.lang.String eName,
                              java.lang.String aName,
                              java.lang.String type,
                              java.lang.String valueDefault,
                              java.lang.String value)
                       throws SAXException

  Report an attribute type declaration.

  Only the effective (first) declaration for an attribute will be reported. The type will be one of the strings "CDATA", "ID", "IDREF", "IDREFS", "NMTOKEN", "NMTOKENS", "ENTITY", "ENTITIES", or "NOTATION", or a parenthesized token group with the separator "|" and all whitespace removed.

  Specified by:
    attributeDecl in interface DeclHandler
  Parameters:
    `eName` - The name of the associated element.
    `aName` - The name of the attribute.
    `type` - A string representing the attribute type.
    `valueDefault` - A string representing the attribute default ("#IMPLIED", "#REQUIRED", or "#FIXED") or null if none of these applies.
    `value` - A string representing the attribute's default value, or null if there is none.
  Throws:
    SAXException - The application may raise an exception.

### internalEntityDecl

    public void internalEntityDecl(java.lang.String name,
                                   java.lang.String value)
                            throws SAXException

  Report an internal entity declaration.

  Only the effective (first) declaration for each entity will be reported.

  Specified by:
    internalEntityDecl in interface DeclHandler
  Parameters:
    `name` - The name of the entity. If it is a parameter entity, the name will begin with '%'.
    `value` - The replacement text of the entity.
  Throws:
    SAXException - The application may raise an exception.
  See Also:
    `externalEntityDecl(java.lang.String, java.lang.String, java.lang.String)`, `DTDHandler.unparsedEntityDecl(java.lang.String, java.lang.String, java.lang.String, java.lang.String)`

### externalEntityDecl

    public void externalEntityDecl(java.lang.String name,
                                   java.lang.String publicId,
                                   java.lang.String systemId)
                            throws SAXException

  Report a parsed external entity declaration.

  Only the effective (first) declaration for each entity will be reported.

  Specified by:
    externalEntityDecl in interface DeclHandler
  Parameters:
    `name` - The name of the entity. If it is a parameter entity, the name will begin with '%'.
    `publicId` - The declared public identifier of the entity, or null if none was declared.
    `systemId` - The declared system identifier of the entity.
  Throws:
    SAXException - The application may raise an exception.
  See Also:
    `internalEntityDecl(java.lang.String, java.lang.String)`, `DTDHandler.unparsedEntityDecl(java.lang.String, java.lang.String, java.lang.String, java.lang.String)`

### startDTD

    public void startDTD(java.lang.String name,
                         java.lang.String publicId,
                         java.lang.String systemId)
                  throws SAXException

  Report the start of DTD declarations, if any.

  Any declarations are assumed to be in the internal subset unless otherwise indicated by a startEntity event.

  Note that the start/endDTD events will appear within the start/endDocument events from ContentHandler and before the first startElement event.

  Specified by:
    startDTD in interface LexicalHandler
  Parameters:
    `name` - The document type name.
    `publicId` - The declared public identifier for the external DTD subset, or null if none was declared.
    `systemId` - The declared system identifier for the external DTD subset, or null if none was declared.
  Throws:
    SAXException - The application may raise an exception.
  See Also:
    `endDTD()`, `startEntity(java.lang.String)`

### endDTD

    public void endDTD()
                throws SAXException

  Report the end of DTD declarations.
  Specified by:
    endDTD in interface LexicalHandler
  Throws:
    SAXException - The application may raise an exception.
  See Also:
    `startDTD(java.lang.String, java.lang.String, java.lang.String)`

### startEntity

    public void startEntity(java.lang.String name)
                     throws SAXException

  Report the beginning of an entity in content.

  NOTE: entity references in attribute values -- and the start and end of the document entity -- are never reported.

  The start and end of the external DTD subset are reported using the pseudo-name "[dtd]". All other events must be properly nested within start/end entity events.

  Note that skipped entities will be reported through the skippedEntity event, which is part of the ContentHandler interface.

  Specified by:
    startEntity in interface LexicalHandler
  Parameters:
    `name` - The name of the entity. If it is a parameter entity, the name will begin with '%'.
  Throws:
    SAXException - The application may raise an exception.
  See Also:
    `endEntity(java.lang.String)`, `DeclHandler.internalEntityDecl(java.lang.String, java.lang.String)`, `DeclHandler.externalEntityDecl(java.lang.String, java.lang.String, java.lang.String)`

### endEntity

    public void endEntity(java.lang.String name)
                   throws SAXException

  Report the end of an entity.
  Specified by:
    endEntity in interface LexicalHandler
  Parameters:
    `name` - The name of the entity that is ending.
  Throws:
    SAXException - The application may raise an exception.
  See Also:
    `startEntity(java.lang.String)`

### startCDATA

    public void startCDATA()
                    throws SAXException

  Report the start of a CDATA section.

  The contents of the CDATA section will be reported through the regular characters event.

  Specified by:
    startCDATA in interface LexicalHandler
  Throws:
    SAXException - The application may raise an exception.
  See Also:
    `endCDATA()`

### endCDATA

    public void endCDATA()
                  throws SAXException

  Report the end of a CDATA section.
  Specified by:
    endCDATA in interface LexicalHandler
  Throws:
    SAXException - The application may raise an exception.
  See Also:
    `startCDATA()`

### comment

    public void comment(char[] ch,
                        int start,
                        int length)
                 throws SAXException

  Report an XML comment anywhere in the document.

  This callback will be used for comments inside or outside the document element, including comments in the external DTD subset (if read).

  Specified by:
    comment in interface LexicalHandler
  Parameters:
    `ch` - An array holding the characters in the comment.
    `start` - The starting position in the array.
    `length` - The number of characters to use from the array.
  Throws:
    SAXException - The application may raise an exception.

### setProperty

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

  Set a run time property for this DTM instance. %REVIEW% Now that we no longer use this method to support getSourceLocatorFor, can we remove it?
  Parameters:
    `property` - a `String` value
    `value` - an `Object` value

### getSourceLocatorFor

    public SourceLocator getSourceLocatorFor(int node)

  Retrieve the SourceLocator associated with a specific node. This is only meaningful if the XalanProperties.SOURCE_LOCATION flag was set True using setProperty; if it was never set, or was set false, we will return null. (We _could_ return a locator with the document's base URI and bogus line/column information. Trying that; see the else clause.)

### getFixedNames

    public java.lang.String getFixedNames(int type)

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