Xerces-C++: DOMConfiguration Class Reference

Xerces-C++ 3.3.0

List of all members
DOMConfiguration Class Referenceabstract

The DOMConfiguration interface represents the configuration of a document and maintains a table of recognized parameters. More...

`#include <xercesc/dom/DOMConfiguration.hpp>`

## Public Member Functions
Destructor
virtual | ~DOMConfiguration ()
| Destructor.

## Protected Member Functions
Hidden constructors
| DOMConfiguration ()

## Unimplemented constructors and operators
virtual void | setParameter (const XMLCh *name, const void *value)=0
| Set the value of a parameter.
virtual void | setParameter (const XMLCh *name, bool value)=0
virtual const void * | getParameter (const XMLCh *name) const =0
| Return the value of a parameter if known.
virtual bool | canSetParameter (const XMLCh *name, const void *value) const =0
| Check if setting a parameter to a specific value is supported.
virtual bool | canSetParameter (const XMLCh *name, bool value) const =0
virtual const DOMStringList * | getParameterNames () const =0
| The list of the parameters supported by this DOMConfiguration object and for which at least one value can be set by the application.

## Detailed Description

The DOMConfiguration interface represents the configuration of a document and maintains a table of recognized parameters.

Using the configuration, it is possible to change Document.normalizeDocument behavior, such as replacing CDATASection nodes with Text nodes or specifying the type of the schema that must be used when the validation of the Document is requested. DOMConfiguration objects are also used in [DOM Level 3 Load and Save] in the DOMLSParser and DOMLSSerializer interfaces.

The DOMConfiguration distinguish two types of parameters: boolean (boolean parameters) and DOMUserData (parameters). The names used by the DOMConfiguration object are defined throughout the DOM Level 3 specifications. Names are case-insensitive. To avoid possible conflicts, as a convention, names referring to boolean parameters and parameters defined outside the DOM specification should be made unique. Names are recommended to follow the XML name production rule but it is not enforced by the DOM implementation. DOM Level 3 Core Implementations are required to recognize all boolean parameters and parameters defined in this specification. Each boolean parameter state or parameter value may then be supported or not by the implementation. Refer to their definition to know if a state or a value must be supported or not.

Note: Parameters are similar to features and properties used in SAX2 [SAX].

The following list of parameters defined in the DOM:

"error-handler" [required] A DOMErrorHandler object. If an error is encountered in the document, the implementation will call back the DOMErrorHandler registered using this parameter. When called, DOMError.relatedData will contain the closest node to where the error occured. If the implementation is unable to determine the node where the error occurs, DOMError.relatedData will contain the Document node. Mutations to the document from within an error handler will result in implementation dependent behaviour.

"schema-type" [optional] A DOMString object containing an absolute URI and representing the type of the schema language used to validate a document against. Note that no lexical checking is done on the absolute URI. If this parameter is not set, a default value may be provided by the implementation, based on the schema languages supported and on the schema language used at load time.

Note: For XML Schema [XML Schema Part 1], applications must use the value "http://www.w3.org/2001/XMLSchema". For XML DTD [XML 1.0], applications must use the value "http://www.w3.org/TR/REC-xml". Other schema languages are outside the scope of the W3C and therefore should recommend an absolute URI in order to use this method.

"schema-location" [optional] A DOMString object containing a list of URIs, separated by white spaces (characters matching the nonterminal production S defined in section 2.3 [XML 1.0]), that represents the schemas against which validation should occur. The types of schemas referenced in this list must match the type specified with schema-type, otherwise the behaviour of an implementation is undefined. If the schema type is XML Schema [XML Schema Part 1], only one of the XML Schemas in the list can be with no namespace. If validation occurs against a namespace aware schema, i.e. XML Schema, and the targetNamespace of a schema (specified using this property) matches the targetNamespace of a schema occurring in the instance document, i.e in schemaLocation attribute, the schema specified by the user using this property will be used (i.e., in XML Schema the schemaLocation attribute in the instance document or on the import element will be effectively ignored).

Note: It is illegal to set the schema-location parameter if the schema-type parameter value is not set. It is strongly recommended that DOMInputSource.baseURI will be set, so that an implementation can successfully resolve any external entities referenced.

The following list of boolean parameters (features) defined in the DOM:

"canonical-form"

      true
              [optional]
              Canonicalize  the  document  according to the rules
              specified  in [Canonical XML]. Note that this
              is  limited  to what can be represented in the DOM.
              In particular, there is no way to specify the order
              of the attributes in the DOM.

      false
              [required] (default)
              Do not canonicalize the document.

"cdata-sections"

      true
              [required] (default)
              Keep CDATASection nodes in the document.

      false
              [required]
              Transform  CDATASection nodes in the document
              into  Text  nodes. The new Text node is
              then combined with any adjacent Text node.

"comments"

      true
              [required] (default)
              Keep Comment nodes in the document.

      false
              [required]
              Discard Comment nodes in the Document.

"datatype-normalization"

      true
              [required]
              Exposed normalized values in the tree.

      false
              [required] (default)
              Do not perform normalization on the tree.

"discard-default-content"

      true
              [required] (default)
              Use   whatever   information   available   to   the
              implementation (i.e. XML schema, DTD, the specified
              flag on Attr nodes, and so on) to decide what
              attributes  and content should be discarded or not.
              Note that the specified flag on Attr nodes in
              itself  is not always reliable, it is only reliable
              when  it  is set to false since the only case where
              it  can  be  set  to  false is if the attribute was
              created  by the implementation. The default content
              won't be removed if an implementation does not have
              any information available.

      false
              [required]
              Keep all attributes and all content.

"entities"

      true
              [required]
              Keep  EntityReference  and Entity nodes
              in the document.

      false
              [required] (default)
              Remove  all  EntityReference and Entity
              nodes   from   the  document,  putting  the  entity
              expansions  directly  in  their  place.  Text
              nodes     are     into    "normal"    form.    Only
              EntityReference nodes to non-defined entities
              are kept in the document.

"infoset"

      true
              [required]
              Only  keep  in the document the information defined
              in  the  XML Information Set [XML Information
              set].
              This   forces  the  following  features  to  false:
              namespace-declarations,         validate-if-schema,
              entities, datatype-normalization, cdata-sections.
              This   forces   the  following  features  to  true:
              whitespace-in-element-content,            comments,
              namespaces.
              Other  features  are  not  changed unless explicitly
              specified in the description of the features.
              Note  that  querying  this  feature with getFeature
              returns   true  only  if  the  individual  features
              specified above are appropriately set.

      false
              Setting infoset to false has no effect.

"namespaces"

      true
              [required] (default)
              Perform  the  namespace  processing  as  defined in
              [XML Namespaces].

      false
              [optional]
              Do not perform the namespace processing.

"namespace-declarations"

      true
              [required] (default)
              Include namespace declaration attributes, specified
              or  defaulted  from  the  schema or the DTD, in the
              document.  See  also  the  section  Declaring
              Namespaces in [XML Namespaces].

      false
              [required]
              Discard  all  namespace declaration attributes. The
              Namespace   prefixes  are  retained  even  if  this
              feature is set to false.

"normalize-characters"

      true
              [optional]
              Perform   the   W3C   Text   Normalization  of  the
              characters [CharModel] in the document.

      false
              [required] (default)
              Do not perform character normalization.

"split-cdata-sections"

      true
              [required] (default)
              Split  CDATA  sections containing the CDATA section
              termination  marker  ']]>'. When a CDATA section is
              split a warning is issued.

      false
              [required]
              Signal an error if a CDATASection contains an
              unrepresentable character.

"validate"

      true
              [optional]
              Require  the  validation against a schema (i.e. XML
              schema,  DTD,  any  other type or representation of
              schema)  of  the document as it is being normalized
              as defined by [XML 1.0]. If validation errors
              are  found,  or  no  schema  was  found,  the error
              handler  is  notified.  Note  also  that normalized
              values  will  not  be exposed to the schema in used
              unless the feature datatype-normalization is true.

              Note:  validate-if-schema and validate are mutually
              exclusive, setting one of them to true will set the
              other one to false.

      false
              [required] (default)
              Only  XML  1.0  non-validating  processing  must be
              done.  Note  that  validation might still happen if
              validate-if-schema is true.

"validate-if-schema"

      true
              [optional]
              Enable  validation  only  if  a declaration for the
              document  element  can  be  found (independently of
              where  it  is  found,  i.e. XML schema, DTD, or any
              other   type   or  representation  of  schema).  If
              validation  errors  are found, the error handler is
              notified. Note also that normalized values will not
              be exposed to the schema in used unless the feature
              datatype-normalization is true.

              Note:  validate-if-schema and validate are mutually
              exclusive, setting one of them to true will set the
              other one to false.

      false
              [required] (default)
              No  validation  should be performed if the document
              has  a  schema.  Note  that  validation  must still
              happen if validate is true.

"element-content-whitespace"

      true
              [required] (default)
              Keep all white spaces in the document.

      false
              [optional]
              Discard   white  space  in  element  content  while
              normalizing.  The implementation is expected to use
              the isWhitespaceInElementContent flag on Text
              nodes to determine if a text node should be written
              out or not.

The resolutions of entities is done using Document.baseURI. However, when the features "LS-Load" or "LS-Save" defined in [DOM Level 3 Load and Save] are supported by the DOM implementation, the parameter "entity-resolver" can also be used on DOMConfiguration objects attached to Document nodes. If this parameter is set, Document.normalizeDocument will invoke the entity resolver instead of using Document.baseURI.

## Constructor & Destructor Documentation

## ◆ DOMConfiguration()

DOMConfiguration::DOMConfiguration | ( |  | ) |
| protected

## ◆ ~DOMConfiguration()

virtual DOMConfiguration::~DOMConfiguration | ( |  | ) |
| virtual

Destructor.

## Member Function Documentation

## ◆ canSetParameter() [1/2]

virtual bool DOMConfiguration::canSetParameter | ( | const XMLCh * | name,
|  | bool | value ) const
| pure virtual

## ◆ canSetParameter() [2/2]

virtual bool DOMConfiguration::canSetParameter | ( | const XMLCh * | name,
|  | const void * | value ) const
| pure virtual

Check if setting a parameter to a specific value is supported.

Parameters

  name | The name of the parameter to check.
  value | An object. if null, the returned value is true.

Returns
  true if the parameter could be successfully set to the specified value, or false if the parameter is not recognized or the requested value is not supported. This does not change the current value of the parameter itself.

Since
  DOM level 3

## ◆ getParameter()

virtual const void * DOMConfiguration::getParameter | ( | const XMLCh * | name | ) | const
| pure virtual

Return the value of a parameter if known.

Parameters

  name | The name of the parameter.

Returns
  The current object associated with the specified parameter or null if no object has been associated or if the parameter is not supported.

Exceptions

  DOMException | (NOT_FOUND_ERR) Raised when the i boolean parameter name is not recognized.

Since
  DOM level 3

## ◆ getParameterNames()

virtual const DOMStringList * DOMConfiguration::getParameterNames | ( |  | ) | const
| pure virtual

The list of the parameters supported by this DOMConfiguration object and for which at least one value can be set by the application.

Note that this list can also contain parameter names defined outside this specification.

Returns
  The list of parameters that can be used with setParameter/getParameter

Since
  DOM level 3

## ◆ setParameter() [1/2]

virtual void DOMConfiguration::setParameter | ( | const XMLCh * | name,
|  | bool | value )
| pure virtual

## ◆ setParameter() [2/2]

virtual void DOMConfiguration::setParameter | ( | const XMLCh * | name,
|  | const void * | value )
| pure virtual

Set the value of a parameter.

Parameters

  name | The name of the parameter to set.
  value | The new value or null if the user wishes to unset the parameter. While the type of the value parameter is defined as `DOMUserData`, the object type must match the type defined by the definition of the parameter. For example, if the parameter is "error-handler", the value must be of type `DOMErrorHandler`

Exceptions

  DOMException | (NOT_SUPPORTED_ERR) Raised when the parameter name is recognized but the requested value cannot be set.
  DOMException | (NOT_FOUND_ERR) Raised when the parameter name is not recognized.

Since
  DOM level 3

The documentation for this class was generated from the following file:

- DOMConfiguration.hpp