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## org.apache.fop.fo
Class FONode

    java.lang.Object
      org.apache.fop.fo.FONode

All Implemented Interfaces:
  java.lang.Cloneable

Direct Known Subclasses:
  AbstractAFPExtensionObject, AbstractMetadataElement, AbstractPSExtensionElement, AbstractPSExtensionObject, Destination, FObj, FOText, XMLObj

public abstract class FONode
extends java.lang.Object
implements java.lang.Cloneable

Base class for nodes in the XML tree

Nested Class Summary
`static interface` | `FONode.FONodeIterator` Base iterator interface over a FO's children
`static class` | `FONode.GatherContextInfoFunction` Function for AdvancedMessageFormat to retrieve context info from an FONode.

Field Summary
`protected static java.lang.String` | `FO_URI` the XSL-FO namespace URI
`protected static java.lang.String` | `FOX_URI` FOP's proprietary extension namespace URI
`protected org.xml.sax.Locator` | `locator` Marks the location of this object from the input FO Call `locator.getSystemId()`, `getLineNumber()`, `getColumnNumber()` for file, line, column information
`protected static org.apache.commons.logging.Log` | `log` Logger for fo-tree related messages
`protected FONode` | `parent` Parent FO node
`protected FONode[]` | `siblings` pointer to the sibling nodes

Constructor Summary
`protected` | `FONode(FONode parent)` Base constructor

Method Summary
`protected void` | `addCharacters(char[] data, int start, int end, PropertyList pList, org.xml.sax.Locator locator)` Deprecated. Please override `characters(char[], int, int, PropertyList, Locator)` instead!
`protected void` | `addChildNode(FONode child)` Adds a node as a child of this node.
`protected static void` | `attachSiblings(FONode precedingSibling, FONode followingSibling)` This method is used when adding child nodes to a FO that already contains at least one child.
`void` | `bind(PropertyList propertyList)` Bind the given `PropertyList` to this node Does nothing by default.
`protected boolean` | `canHaveMarkers()` Returns `true` if `fo:marker` is allowed as a child node.
`protected void` | `characters(char[] data, int start, int length, PropertyList pList, org.xml.sax.Locator locator)` Adds characters.
`CharIterator` | `charIterator()` Return a `CharIterator` over all characters in this node
`protected java.lang.Object` | `clone()`
`FONode` | `clone(FONode cloneparent, boolean removeChildren)` Performs a shallow cloning operation, sets the clone's parent, and optionally cleans the list of child nodes
`protected PropertyList` | `createPropertyList(PropertyList pList, FOEventHandler foEventHandler)` Create a property list for this node.
`static java.lang.String` | `decorateWithContextInfo(java.lang.String text, FONode node)` Decorates a log or warning message with context information on the given node.
`protected void` | `endOfNode()` Primarily used for making final content model validation checks and/or informing the `FOEventHandler` that the end of this FO has been reached.
`protected static java.lang.String` | `errorText(org.xml.sax.Locator loc)` Helper function to return "Error(line#/column#)" string for above exception messages
`void` | `finalizeNode()` Finalize this node.
`protected java.lang.String` | `gatherContextInfo()` Gathers context information for the getContextInfo() method.
`FOTreeBuilderContext` | `getBuilderContext()` Returns the context class providing information used during FO tree building.
`FONode.FONodeIterator` | `getChildNodes()` Return an iterator over all the child nodes of this node.
`FONode.FONodeIterator` | `getChildNodes(FONode childNode)` Return an iterator over the object's child nodes starting at the passed node.
`ContentHandlerFactory` | `getContentHandlerFactory()` This method is overridden by extension elements and allows the extension element to return a `ContentHandlerFactory`.
`java.lang.String` | `getContextInfo()` Deprecated. Not localized! Should rename getContextInfoAlt() to getContextInfo() when done!
`protected java.lang.String` | `getContextInfoAlt()` Returns a String containing as some context information about a node.
`ExtensionAttachment` | `getExtensionAttachment()` This method is overridden by extension elements and allows the extension element to return a pass-through attachment which the parent formatting objects should simply carry with them but otherwise ignore.
`FOEventHandler` | `getFOEventHandler()` Recursively goes up the FOTree hierarchy until the `fo:root` is found, which returns the parent `FOEventHandler`.
`protected FOValidationEventProducer` | `getFOValidationEventProducer()` Returns an instance of the FOValidationEventProducer.
`abstract java.lang.String` | `getLocalName()` Returns the local name (i.e.
`org.xml.sax.Locator` | `getLocator()` Returns the `Locator` containing the location information for this element, or `null` if not available
`static java.lang.String` | `getLocatorString(org.xml.sax.Locator loc)` Helper function to format a Locator instance.
`org.apache.commons.logging.Log` | `getLogger()` Returns the logger for the node.
`java.lang.String` | `getName()` Returns the fully qualified name of the node
`java.lang.String` | `getName(java.lang.String prefix)` Returns the fully qualified name of the node
`int` | `getNameId()` Returns the `Constants` class integer value of this node
`java.lang.String` | `getNamespaceURI()` Returns the namespace URI for this node
`static java.lang.String` | `getNodeString(java.lang.String namespaceURI, java.lang.String localName)` Helper function to standardize the names of all namespace URI - local name pairs in text messages.
`abstract java.lang.String` | `getNormalNamespacePrefix()` Returns the normally used namespace prefix for this node
`FONode` | `getParent()` Return the parent node of this node
`Root` | `getRoot()` Returns the root node of this tree
`FOUserAgent` | `getUserAgent()` Returns the user agent that is associated with the tree's `FOEventHandler`.
`protected boolean` | `inMarker()` Indicates whether this node is a child of an fo:marker.
`protected void` | `invalidChildError(org.xml.sax.Locator loc, java.lang.String nsURI, java.lang.String lName)` Helper function to return "invalid child" exceptions (e.g., `fo:block` appearing immediately under `fo:root`)
`protected void` | `invalidChildError(org.xml.sax.Locator loc, java.lang.String parentName, java.lang.String nsURI, java.lang.String lName, java.lang.String ruleViolated)` Helper function to return "invalid child" exceptions with more complex validation rules (i.e., needing more explanation of the problem)
`protected void` | `missingChildElementError(java.lang.String contentModel)` Helper function to throw an error caused by missing mandatory child elements.
`protected void` | `missingChildElementError(java.lang.String contentModel, boolean canRecover)` Helper function to throw an error caused by missing mandatory child elements.
`protected void` | `missingPropertyError(java.lang.String propertyName)` Helper function to throw an error caused by missing mandatory properties
`protected void` | `nodesOutOfOrderError(org.xml.sax.Locator loc, java.lang.String tooLateNode, java.lang.String tooEarlyNode)` Helper function to standardize "out of order" exceptions (e.g., `fo:layout-master-set` appearing after `fo:page-sequence`)
`protected void` | `nodesOutOfOrderError(org.xml.sax.Locator loc, java.lang.String tooLateNode, java.lang.String tooEarlyNode, boolean canRecover)` Helper function to standardize "out of order" exceptions (e.g., fo:layout-master-set appearing after fo:page-sequence)
`void` | `processNode(java.lang.String elementName, org.xml.sax.Locator locator, org.xml.sax.Attributes attlist, PropertyList pList)` Initialize the node with its name, location information, and attributes The attributes must be used immediately as the sax attributes will be altered for the next element.
`void` | `removeChild(FONode child)` Removes a child node.
`void` | `setLocator(org.xml.sax.Locator locator)` Set the location information for this element
`protected void` | `startOfNode()` Called after processNode() is called.
`protected void` | `tooManyNodesError(org.xml.sax.Locator loc, org.apache.xmlgraphics.util.QName offendingNode)` Helper function to standardize "too many" error exceptions (e.g., two `fo:declarations` within `fo:root`)
`protected void` | `tooManyNodesError(org.xml.sax.Locator loc, java.lang.String offendingNode)` Helper function to standardize "too many" error exceptions (e.g., two fo:declarations within fo:root) This overloaded method helps make the caller code better self-documenting
`protected void` | `tooManyNodesError(org.xml.sax.Locator loc, java.lang.String nsURI, java.lang.String lName)` Helper function to standardize "too many" error exceptions (e.g., two fo:declarations within fo:root)
`protected static void` | `validateChildNode(FONode fo, org.xml.sax.Locator loc, java.lang.String namespaceURI, java.lang.String localName)` Static version of `validateChildNode(Locator, String, String)` that can be used by subclasses that need to validate children against a different node (for example: `fo:wrapper` needs to check if the incoming node is a valid child to its parent)
`protected void` | `validateChildNode(org.xml.sax.Locator loc, java.lang.String namespaceURI, java.lang.String localName)` Checks to make sure, during SAX processing of input document, that the incoming node is valid for this (parent) node (e.g., checking to see that `fo:table` is not an immediate child of `fo:root`) called from `FOTreeBuilder.startElement(String, String, String, Attributes)` before constructing the child `FObj`.
`protected static java.lang.String` | `warningText(org.xml.sax.Locator loc)` Helper function to return "Warning(line#/column#)" string for warning messages

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

Field Detail

### FO_URI

    protected static final java.lang.String FO_URI

  the XSL-FO namespace URI

  See Also:
    Constant Field Values

### FOX_URI

    protected static final java.lang.String FOX_URI

  FOP's proprietary extension namespace URI

  See Also:
    Constant Field Values

### parent

    protected FONode parent

  Parent FO node

### siblings

    protected FONode[] siblings

  pointer to the sibling nodes

### locator

    protected org.xml.sax.Locator locator

  Marks the location of this object from the input FO
  Call `locator.getSystemId()`, `getLineNumber()`, `getColumnNumber()` for file, line, column information

### log

    protected static org.apache.commons.logging.Log log

  Logger for fo-tree related messages

Constructor Detail

### FONode

    protected FONode(FONode parent)

  Base constructor

Parameters:
  `parent` - parent of this node

Method Detail

### clone

    public FONode clone(FONode cloneparent,
                        boolean removeChildren)
                 throws FOPException

  Performs a shallow cloning operation, sets the clone's parent, and optionally cleans the list of child nodes

  Parameters:
    `cloneparent` - the intended parent of the clone
    `removeChildren` - if true, clean the list of child nodes
  Returns:
    the cloned FO node
  Throws:
    `FOPException` - if there's a problem while cloning the node

### clone

    protected java.lang.Object clone()

### bind

    public void bind(PropertyList propertyList)
              throws FOPException

  Bind the given `PropertyList` to this node Does nothing by default. Subclasses should override this method in case they want to use the properties available on the `PropertyList`.

  Parameters:
    `propertyList` - the `PropertyList`
  Throws:
    `FOPException` - if there was an error when processing the `PropertyList`

### setLocator

    public void setLocator(org.xml.sax.Locator locator)

  Set the location information for this element

  Parameters:
    `locator` - the org.xml.sax.Locator object

### getLocator

    public org.xml.sax.Locator getLocator()

  Returns the `Locator` containing the location information for this element, or `null` if not available

  Returns:
    the location information for this element or `null`, if not available

### getFOEventHandler

    public FOEventHandler getFOEventHandler()

  Recursively goes up the FOTree hierarchy until the `fo:root` is found, which returns the parent `FOEventHandler`.
  (see also: `Root.getFOEventHandler()`)

  Returns:
    the FOEventHandler object that is the parent of the FO Tree

### getBuilderContext

    public FOTreeBuilderContext getBuilderContext()

  Returns the context class providing information used during FO tree building.

  Returns:
    the builder context

### inMarker

    protected boolean inMarker()

  Indicates whether this node is a child of an fo:marker.

  Returns:
    true if this node is a child of an fo:marker

### getUserAgent

    public FOUserAgent getUserAgent()

  Returns the user agent that is associated with the tree's `FOEventHandler`.

  Returns:
    the user agent

### getLogger

    public org.apache.commons.logging.Log getLogger()

  Returns the logger for the node.

  Returns:
    the logger

### processNode

    public void processNode(java.lang.String elementName,
                            org.xml.sax.Locator locator,
                            org.xml.sax.Attributes attlist,
                            PropertyList pList)
                     throws FOPException

  Initialize the node with its name, location information, and attributes The attributes must be used immediately as the sax attributes will be altered for the next element.

  Parameters:
    `elementName` - element name (e.g., "fo:block")
    `locator` - Locator object (ignored by default)
    `attlist` - Collection of attributes passed to us from the parser.
    `pList` - the property list of the parent node
  Throws:
    `FOPException` - for errors or inconsistencies in the attributes

### createPropertyList

    protected PropertyList createPropertyList(PropertyList pList,
                                              FOEventHandler foEventHandler)
                                       throws FOPException

  Create a property list for this node. Return null if the node does not need a property list.

  Parameters:
    `pList` - the closest parent propertylist.
    `foEventHandler` - The FOEventHandler where the PropertyListMaker instance can be found.
  Returns:
    A new property list.
  Throws:
    `FOPException` - if there's a problem during processing

### validateChildNode

    protected void validateChildNode(org.xml.sax.Locator loc,
                                     java.lang.String namespaceURI,
                                     java.lang.String localName)
                              throws ValidationException

  Checks to make sure, during SAX processing of input document, that the incoming node is valid for this (parent) node (e.g., checking to see that `fo:table` is not an immediate child of `fo:root`) called from `FOTreeBuilder.startElement(String, String, String, Attributes)` before constructing the child `FObj`.

  Parameters:
    `loc` - location in the FO source file
    `namespaceURI` - namespace of incoming node
    `localName` - name of the incoming node (without namespace prefix)
  Throws:
    `ValidationException` - if incoming node not valid for parent

### validateChildNode

    protected static void validateChildNode(FONode fo,
                                            org.xml.sax.Locator loc,
                                            java.lang.String namespaceURI,
                                            java.lang.String localName)
                                     throws ValidationException

  Static version of `validateChildNode(Locator, String, String)` that can be used by subclasses that need to validate children against a different node (for example: `fo:wrapper` needs to check if the incoming node is a valid child to its parent)

  Parameters:
    `fo` - the `FONode` to validate against
    `loc` - location in the source file
    `namespaceURI` - namespace of the incoming node
    `localName` - name of the incoming node (without namespace prefix)
  Throws:
    `ValidationException` - if the incoming node is not a valid child for the given FO

### addCharacters

    protected void addCharacters(char[] data,
                                 int start,
                                 int end,
                                 PropertyList pList,
                                 org.xml.sax.Locator locator)
                          throws FOPException

  Deprecated. Please override `characters(char[], int, int, PropertyList, Locator)` instead!

  Adds characters. Does nothing by default. To be overridden in subclasses that allow `#PCDATA` content.

  Parameters:
    `data` - array of characters containing text to be added
    `start` - starting array element to add
    `end` - ending array element to add
    `pList` - currently applicable PropertyList
    `locator` - location in the XSL-FO source file.
  Throws:
    `FOPException` - if there's a problem during processing

### characters

    protected void characters(char[] data,
                              int start,
                              int length,
                              PropertyList pList,
                              org.xml.sax.Locator locator)
                       throws FOPException

  Adds characters. Does nothing by default. To be overridden in subclasses that allow `#PCDATA` content.

  Parameters:
    `data` - array of characters containing text to be added
    `start` - starting array element to add
    `length` - number of elements to add
    `pList` - currently applicable PropertyList
    `locator` - location in the XSL-FO source file.
  Throws:
    `FOPException` - if there's a problem during processing

### startOfNode

    protected void startOfNode()
                        throws FOPException

  Called after processNode() is called. Subclasses can do additional processing.

  Throws:
    `FOPException` - if there's a problem during processing

### endOfNode

    protected void endOfNode()
                      throws FOPException

  Primarily used for making final content model validation checks and/or informing the `FOEventHandler` that the end of this FO has been reached. The default implementation simply calls `finalizeNode()`, without sending any event to the `FOEventHandler`.
  Note: the recommended way to override this method in subclasses is
  `super.endOfNode(); // invoke finalizeNode()
  getFOEventHandler().endXXX(); // send endOfNode() notification`

  Throws:
    `FOPException` - if there's a problem during processing

### addChildNode

    protected void addChildNode(FONode child)
                         throws FOPException

  Adds a node as a child of this node. The default implementation of this method just ignores any child node being added.

  Parameters:
    `child` - child node to be added to the childNodes of this node
  Throws:
    `FOPException` - if there's a problem during processing

### removeChild

    public void removeChild(FONode child)

  Removes a child node. Used by the child nodes to remove themselves, for example table-body if it has no children.

  Parameters:
    `child` - child node to be removed

### finalizeNode

    public void finalizeNode()
                      throws FOPException

  Finalize this node. This method can be overridden by subclasses to perform finishing tasks (cleanup, validation checks, ...) without triggering endXXX() events in the `FOEventHandler`. The method is called by the default `endOfNode()` implementation.

  Throws:
    `FOPException` - in case there was an error

### getParent

    public FONode getParent()

  Return the parent node of this node

  Returns:
    the parent node of this node

### getChildNodes

    public FONode.FONodeIterator getChildNodes()

  Return an iterator over all the child nodes of this node.

  Returns:
    the iterator over the FO's childnodes

### getChildNodes

    public FONode.FONodeIterator getChildNodes(FONode childNode)

  Return an iterator over the object's child nodes starting at the passed node.

  Parameters:
    `childNode` - First node in the iterator
  Returns:
    the iterator, or `null` if the given node is not a child of this node.

### charIterator

    public CharIterator charIterator()

  Return a `CharIterator` over all characters in this node

  Returns:
    an iterator for the characters in this node

### getNodeString

    public static java.lang.String getNodeString(java.lang.String namespaceURI,
                                                 java.lang.String localName)

  Helper function to standardize the names of all namespace URI - local name pairs in text messages. For readability, using fo:, fox:, svg:, for those namespaces even though that prefix may not have been chosen in the document.

  Parameters:
    `namespaceURI` - URI of node found (e.g., "http://www.w3.org/1999/XSL/Format")
    `localName` - local name of node, (e.g., "root" for "fo:root")
  Returns:
    the prefix:localname, if fo/fox/svg, or a longer representation with the unabbreviated URI otherwise.

### getFOValidationEventProducer

    protected FOValidationEventProducer getFOValidationEventProducer()

  Returns an instance of the FOValidationEventProducer.

  Returns:
    an event producer for FO validation

### tooManyNodesError

    protected void tooManyNodesError(org.xml.sax.Locator loc,
                                     java.lang.String nsURI,
                                     java.lang.String lName)
                              throws ValidationException

  Helper function to standardize "too many" error exceptions (e.g., two fo:declarations within fo:root)

  Parameters:
    `loc` - org.xml.sax.Locator object of the error (*not* parent node)
    `nsURI` - namespace URI of incoming invalid node
    `lName` - local name (i.e., no prefix) of incoming node
  Throws:
    `ValidationException` - the validation error provoked by the method call

### tooManyNodesError

    protected void tooManyNodesError(org.xml.sax.Locator loc,
                                     org.apache.xmlgraphics.util.QName offendingNode)
                              throws ValidationException

  Helper function to standardize "too many" error exceptions (e.g., two `fo:declarations` within `fo:root`)

  Parameters:
    `loc` - org.xml.sax.Locator object of the error (*not* parent node)
    `offendingNode` - the qualified name of the offending node
  Throws:
    `ValidationException` - the validation error provoked by the method call

### tooManyNodesError

    protected void tooManyNodesError(org.xml.sax.Locator loc,
                                     java.lang.String offendingNode)
                              throws ValidationException

  Helper function to standardize "too many" error exceptions (e.g., two fo:declarations within fo:root) This overloaded method helps make the caller code better self-documenting

  Parameters:
    `loc` - org.xml.sax.Locator object of the error (*not* parent node)
    `offendingNode` - incoming node that would cause a duplication.
  Throws:
    `ValidationException` - the validation error provoked by the method call

### nodesOutOfOrderError

    protected void nodesOutOfOrderError(org.xml.sax.Locator loc,
                                        java.lang.String tooLateNode,
                                        java.lang.String tooEarlyNode)
                                 throws ValidationException

  Helper function to standardize "out of order" exceptions (e.g., `fo:layout-master-set` appearing after `fo:page-sequence`)

  Parameters:
    `loc` - org.xml.sax.Locator object of the error (*not* parent node)
    `tooLateNode` - string name of node that should be earlier in document
    `tooEarlyNode` - string name of node that should be later in document
  Throws:
    `ValidationException` - the validation error provoked by the method call

### nodesOutOfOrderError

    protected void nodesOutOfOrderError(org.xml.sax.Locator loc,
                                        java.lang.String tooLateNode,
                                        java.lang.String tooEarlyNode,
                                        boolean canRecover)
                                 throws ValidationException

  Helper function to standardize "out of order" exceptions (e.g., fo:layout-master-set appearing after fo:page-sequence)

  Parameters:
    `loc` - org.xml.sax.Locator object of the error (*not* parent node)
    `tooLateNode` - string name of node that should be earlier in document
    `tooEarlyNode` - string name of node that should be later in document
    `canRecover` - indicates whether FOP can recover from this problem and continue working
  Throws:
    `ValidationException` - the validation error provoked by the method call

### invalidChildError

    protected void invalidChildError(org.xml.sax.Locator loc,
                                     java.lang.String nsURI,
                                     java.lang.String lName)
                              throws ValidationException

  Helper function to return "invalid child" exceptions (e.g., `fo:block` appearing immediately under `fo:root`)

  Parameters:
    `loc` - org.xml.sax.Locator object of the error (*not* parent node)
    `nsURI` - namespace URI of incoming invalid node
    `lName` - local name (i.e., no prefix) of incoming node
  Throws:
    `ValidationException` - the validation error provoked by the method call

### invalidChildError

    protected void invalidChildError(org.xml.sax.Locator loc,
                                     java.lang.String parentName,
                                     java.lang.String nsURI,
                                     java.lang.String lName,
                                     java.lang.String ruleViolated)
                              throws ValidationException

  Helper function to return "invalid child" exceptions with more complex validation rules (i.e., needing more explanation of the problem)

  Parameters:
    `loc` - org.xml.sax.Locator object of the error (*not* parent node)
    `parentName` - the name of the parent element
    `nsURI` - namespace URI of incoming invalid node
    `lName` - local name (i.e., no prefix) of incoming node
    `ruleViolated` - name of the rule violated (used to lookup a resource in a bundle)
  Throws:
    `ValidationException` - the validation error provoked by the method call

### missingChildElementError

    protected void missingChildElementError(java.lang.String contentModel)
                                     throws ValidationException

  Helper function to throw an error caused by missing mandatory child elements. (e.g., `fo:layout-master-set` not having any `fo:page-master` child element.

  Parameters:
    `contentModel` - The XSL Content Model for the fo: object or a similar description indicating the necessary child elements.
  Throws:
    `ValidationException` - the validation error provoked by the method call

### missingChildElementError

    protected void missingChildElementError(java.lang.String contentModel,
                                            boolean canRecover)
                                     throws ValidationException

  Helper function to throw an error caused by missing mandatory child elements. E.g., fo:layout-master-set not having any page-master child element.

  Parameters:
    `contentModel` - The XSL Content Model for the fo: object or a similar description indicating the necessary child elements.
    `canRecover` - indicates whether FOP can recover from this problem and continue working
  Throws:
    `ValidationException` - the validation error provoked by the method call

### missingPropertyError

    protected void missingPropertyError(java.lang.String propertyName)
                                 throws ValidationException

  Helper function to throw an error caused by missing mandatory properties

  Parameters:
    `propertyName` - the name of the missing property.
  Throws:
    `ValidationException` - the validation error provoked by the method call

### errorText

    protected static java.lang.String errorText(org.xml.sax.Locator loc)

  Helper function to return "Error(line#/column#)" string for above exception messages

  Parameters:
    `loc` - org.xml.sax.Locator object
  Returns:
    String opening error text

### warningText

    protected static java.lang.String warningText(org.xml.sax.Locator loc)

  Helper function to return "Warning(line#/column#)" string for warning messages

  Parameters:
    `loc` - org.xml.sax.Locator object
  Returns:
    String opening warning text

### getLocatorString

    public static java.lang.String getLocatorString(org.xml.sax.Locator loc)

  Helper function to format a Locator instance.

  Parameters:
    `loc` - org.xml.sax.Locator object
  Returns:
    String the formatted text

### decorateWithContextInfo

    public static java.lang.String decorateWithContextInfo(java.lang.String text,
                                                           FONode node)

  Decorates a log or warning message with context information on the given node.

  Parameters:
    `text` - the original message
    `node` - the context node
  Returns:
    the decorated text

### getContextInfo

    public java.lang.String getContextInfo()

  Deprecated. Not localized! Should rename getContextInfoAlt() to getContextInfo() when done!

  Returns a String containing as much context information as possible about a node. Call this method only in exceptional conditions because this method may perform quite extensive information gathering inside the FO tree.

  Returns:
    a String containing context information

### getContextInfoAlt

    protected java.lang.String getContextInfoAlt()

  Returns a String containing as some context information about a node. It does not take the locator into consideration and returns null if no useful context information can be found. Call this method only in exceptional conditions because this method may perform quite extensive information gathering inside the FO tree. All text returned by this method that is not extracted from document content needs to be locale-independent.

  Returns:
    a String containing context information

### gatherContextInfo

    protected java.lang.String gatherContextInfo()

  Gathers context information for the getContextInfo() method.

  Returns:
    the collected context information or null, if none is available

### getRoot

    public Root getRoot()

  Returns the root node of this tree

  Returns:
    the root node

### getName

    public java.lang.String getName()

  Returns the fully qualified name of the node

  Returns:
    the fully qualified name of this node

### getName

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

  Returns the fully qualified name of the node

  Parameters:
    `prefix` - the namespace prefix to build the name with (may be null)
  Returns:
    the fully qualified name of this node

### getLocalName

    public abstract java.lang.String getLocalName()

  Returns the local name (i.e. without namespace prefix) of the node

  Returns:
    the local name of this node

### getNormalNamespacePrefix

    public abstract java.lang.String getNormalNamespacePrefix()

  Returns the normally used namespace prefix for this node

  Returns:
    the normally used namespace prefix for this kind of node (ex. "fo" for XSL-FO)

### getNamespaceURI

    public java.lang.String getNamespaceURI()

  Returns the namespace URI for this node

  Returns:
    the namespace URI for this node

### getNameId

    public int getNameId()

  Returns the `Constants` class integer value of this node

  Returns:
    the integer enumeration of this FO (e.g. `Constants.FO_ROOT`) if a formatting object, `Constants.FO_UNKNOWN_NODE` otherwise

### getExtensionAttachment

    public ExtensionAttachment getExtensionAttachment()

  This method is overridden by extension elements and allows the extension element to return a pass-through attachment which the parent formatting objects should simply carry with them but otherwise ignore. This mechanism is used to pass non-standard information from the FO tree through to the layout engine and the renderers.

  Returns:
    the extension attachment if one is created by the extension element, null otherwise.

### getContentHandlerFactory

    public ContentHandlerFactory getContentHandlerFactory()

  This method is overridden by extension elements and allows the extension element to return a `ContentHandlerFactory`. This factory can create ContentHandler implementations that handle foreign XML content by either building up a specific DOM, a Java object or something else.

  Returns:
    the `ContentHandlerFactory` or `null` if not applicable

### canHaveMarkers

    protected boolean canHaveMarkers()

  Returns `true` if `fo:marker` is allowed as a child node.
  To be overridden only in extension nodes that need it.

  Returns:
    true if markers are valid children

### attachSiblings

    protected static void attachSiblings(FONode precedingSibling,
                                         FONode followingSibling)

  This method is used when adding child nodes to a FO that already contains at least one child. In this case, the new child becomes a sibling to the previous one

  Parameters:
    `precedingSibling` - the previous child
    `followingSibling` - the new child

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