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/*
 * Copyright (c) 2004 World Wide Web Consortium,
 *
 * (Massachusetts Institute of Technology, European Research Consortium for
 * Informatics and Mathematics, Keio University). All Rights Reserved. This
 * work is distributed under the W3C(r) Software License [1] in the hope that
 * it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
 */

package org.w3c.dom;

/**
 *  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 the 
 * 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 DOMParser and DOMSerializer interfaces. 
 *  The parameter 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 parameters defined outside the DOM specification should be 
 * made unique. Because parameters are exposed as properties in the , names 
 * are recommended to follow the section 5.16 Identifiers of [Unicode] with the addition of the character '-' (HYPHEN-MINUS) but it is not 
 * enforced by the DOM implementation. DOM Level 3 Core Implementations are 
 * required to recognize all parameters defined in this specification. Some 
 * parameter values may also be required to be supported by the 
 * implementation. Refer to the definition of the parameter to know if 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: 
 * 

 * 
 * "canonical-form"
 * 
 * 
 * true
 * [optional] Canonicalize the document according to the rules specified in [Canonical XML], 
 * such as removing the DocumentType node (if any) from the 
 * tree, or removing superfluous namespace declarations from each element. 
 * 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. In addition,  Setting this parameter to true will also 
 * set the state of the parameters listed below. Later changes to the state 
 * of one of those parameters will revert "canonical-form" back to 
 * false. Parameters set to false: "entities", "
 * normalize-characters", "cdata-sections". Parameters set to 
 * true: "namespaces", "namespace-declarations", "well-formed", 
 * "element-content-whitespace". Other parameters are not changed unless 
 * explicitly specified in the description of the parameters.
 * 
 * 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.
 * 
 * 
 * "check-character-normalization"
 * 
 * 
 * true
 * [optional] Check if the characters in the document are fully 
 * normalized, as defined in appendix B of [XML 1.1]. When a 
 * sequence of characters is encountered that fails normalization checking, 
 * an error with the DOMError.type equals to 
 * "check-character-normalization-failure" is issued. 
 * false
 * [required] (default)Do not check if characters are normalized.
 * 
 * "comments"
 * 
 * 
 * 
 * true
 * [required] (default)Keep Comment nodes in the document.
 * false
 * [required]Discard Comment nodes in the document.
 * 
 * 
 * "datatype-normalization"
 * 
 * 
 * true
 * [optional] Expose schema normalized values in the tree, such as XML 
 * Schema normalized values in the case of XML Schema. Since this parameter requires to have schema 
 * information, the "validate" parameter will also be set to 
 * true. Having this parameter activated when "validate" is 
 * false has no effect and no schema-normalization will happen. 
 * Note:  Since the document contains the result of the XML 1.0 
 * processing, this parameter does not apply to attribute value 
 * normalization as defined in section 3.3.3 of [XML 1.0] and is only 
 * meant for schema languages other than Document Type Definition (DTD). 
 * 
 * false
 * [required] (default) Do not perform schema normalization on the tree. 
 * 
 * 
 * "element-content-whitespace"
 * 
 * 
 * true
 * [required] (default)Keep all whitespaces in the document.
 * false
 * [optional] Discard all Text nodes that contain whitespaces in element 
 * content, as described in 
 * [element content whitespace]. The implementation is expected to use the attribute 
 * Text.isElementContentWhitespace to determine if a 
 * Text node should be discarded or not.
 * 
 * "entities"
 * 
 * 
 * 
 * true
 * [required] (default)Keep EntityReference nodes in the document.
 * 
 * false
 * [required] Remove all EntityReference nodes from the document, 
 * putting the entity expansions directly in their place. Text 
 * nodes are normalized, as defined in Node.normalize. Only 
 * unexpanded entity references are kept in the document. 
 * 
 * Note:  This parameter does not affect Entity nodes. 
 * 
 * "error-handler"
 * [required] Contains a DOMErrorHandler object. If an error is 
 * encountered in the document, the implementation will call back the 
 * DOMErrorHandler registered using this parameter. The 
 * implementation may provide a default DOMErrorHandler object. 
 *  When called, DOMError.relatedData will contain the closest 
 * node to where the error occurred. 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 behavior. 
 * "infoset"
 * 
 * 
 * 
 * true
 * [required]Keep in the document the information defined in the XML Information Set [XML Information Set]
 * .This forces the following parameters to false: "
 * validate-if-schema", "entities", "datatype-normalization", "cdata-sections
 * ".This forces the following parameters to true: "
 * namespace-declarations", "well-formed", "element-content-whitespace", "
 * comments", "namespaces".Other parameters are not changed unless 
 * explicitly specified in the description of the parameters. Note that 
 * querying this parameter with getParameter returns 
 * true only if the individual parameters specified above are 
 * appropriately set.
 * false
 * Setting infoset to 
 * false has no effect.
 * 
 * "namespaces"
 * 
 * 
 * 
 * true
 * [required] (default) Perform the namespace processing as defined in . 
 * false
 * [optional] Do not perform the namespace processing. 
 * 
 * 
 * "namespace-declarations"
 *  This parameter has no effect if the 
 * parameter "namespaces" is set to false. 
 * 
 * true
 * [required] (default) Include namespace declaration attributes, specified or defaulted from 
 * the schema, in the document. See also the sections "Declaring Namespaces" 
 * in [XML Namespaces]
 *  and [XML Namespaces 1.1]
 * .
 * false
 * [required]Discard all namespace declaration attributes. The namespace prefixes (
 * Node.prefix) are retained even if this parameter is set to 
 * false.
 * 
 * "normalize-characters"
 * 
 * 
 * true
 * [optional] Fully 
 * normalized the characters in the document as defined in appendix B of [XML 1.1]. 
 * 
 * false
 * [required] (default)Do not perform character normalization.
 * 
 * "schema-location"
 * [optional] Represent a DOMString object containing a list of URIs, 
 * separated by whitespaces (characters matching the nonterminal 
 * production S defined in section 2.3 [XML 1.0]), that 
 * represents the schemas against which validation should occur, i.e. the 
 * current schema. The types of schemas referenced in this list must match 
 * the type specified with schema-type, otherwise the behavior 
 * of an implementation is undefined.  The schemas specified using this 
 * property take precedence to the schema information specified in the 
 * document itself. For namespace aware schema, if a schema specified using 
 * this property and a schema specified in the document instance (i.e. using 
 * the schemaLocation attribute) in a schema document (i.e. 
 * using schema import mechanisms) share the same 
 * targetNamespace, the schema specified by the user using this 
 * property will be used. If two schemas specified using this property share 
 * the same targetNamespace or have no namespace, the behavior 
 * is implementation dependent.  If no location has been provided, this 
 * parameter is null. 
 * Note:  The "schema-location" parameter is ignored 
 * unless the "schema-type" parameter value is set. It is strongly 
 * recommended that Document.documentURI will be set so that an 
 * implementation can successfully resolve any external entities referenced. 
 * 
 * "schema-type"
 * [optional] Represent 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. If no value is provided, this 
 * parameter is null. 
 * 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. 
 * "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 with a 
 * DOMError.type equals to 
 * "cdata-sections-splitted" and 
 * DOMError.relatedData equals to the first 
 * CDATASection node in document order resulting from the split.
 * 
 * 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. Schema-normalized values will not be exposed according to the 
 * schema in used unless the parameter "datatype-normalization" is 
 * true.  This parameter will reevaluate: 
 * 
 *  Attribute nodes with 
 * Attr.specified equals to false, as specified in 
 * the description of the Attr interface; 
 * 
 *  The value of the 
 * attribute Text.isElementContentWhitespace for all 
 * Text nodes; 
 * 
 *  The value of the attribute 
 * Attr.isId for all Attr nodes; 
 * 
 *  The attributes 
 * Element.schemaTypeInfo and Attr.schemaTypeInfo. 
 * 
 * 
 * Note:  "validate-if-schema" and "validate" are mutually 
 * exclusive, setting one of them to true will set the other 
 * one to false. Applications should also consider setting the 
 * parameter "well-formed" to true, which is the default for 
 * that option, when validating the document. 
 * false
 * [required] (default) Do not accomplish schema processing, including the internal subset 
 * processing. Default attribute values information are kept. 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 in a schema (independently of where it is found, i.e. XML schema, 
 * DTD, or any other type or representation of schema). If validation is 
 * enabled, this parameter has the same behavior as the parameter "validate" 
 * set to 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 schema processing should be performed if the document has a schema, 
 * including internal subset processing. Default attribute values 
 * information are kept. Note that validation must still happen if "validate
 * " is true. 
 * 
 * "well-formed"
 * 
 * 
 * true
 * [required] (default) Check if all nodes are XML well formed according to the XML version in 
 * use in Document.xmlVersion: 
 * 
 *  check if the attribute 
 * Node.nodeName contains invalid characters according to its 
 * node type and generate a DOMError of type 
 * "wf-invalid-character-in-node-name", with a 
 * DOMError.SEVERITY_ERROR severity, if necessary; 
 * 
 *  check if 
 * the text content inside Attr, Element, 
 * Comment, Text, CDATASection nodes 
 * for invalid characters and generate a DOMError of type 
 * "wf-invalid-character", with a 
 * DOMError.SEVERITY_ERROR severity, if necessary; 
 * 
 *  check if 
 * the data inside ProcessingInstruction nodes for invalid 
 * characters and generate a DOMError of type 
 * "wf-invalid-character", with a 
 * DOMError.SEVERITY_ERROR severity, if necessary; 
 * 
 * 
 * 
 * false
 * [optional] Do not check for XML well-formedness. 
 * 
 * 
 *  The resolution of the system identifiers associated with entities is 
 * done using Document.documentURI. However, when the feature 
 * "LS" defined in [DOM Level 3 Load and Save]
 *  is supported by the DOM implementation, the parameter 
 * "resource-resolver" can also be used on DOMConfiguration 
 * objects attached to Document nodes. If this parameter is 
 * set, Document.normalizeDocument() will invoke the resource 
 * resolver instead of using Document.documentURI. 
 * See also the Document Object Model (DOM) Level 3 Core Specification.
 * @since DOM Level 3
 */
public interface DOMConfiguration {
    /**
     * Set the value of a parameter.
     * @param name The name of the parameter to set.
     * @param 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. 
     * @exception DOMException
     *    NOT_FOUND_ERR: Raised when the parameter name is not recognized. 
     *   
 NOT_SUPPORTED_ERR: Raised when the parameter name is recognized 
     *   but the requested value cannot be set. 
     *   
 TYPE_MISMATCH_ERR: Raised if the value type for this parameter 
     *   name is incompatible with the expected value type. 
     */
    public void setParameter(String name, 
                             Object value)
                             throws DOMException;

    /**
     *  Return the value of a parameter if known. 
     * @param name  The name of the parameter. 
     * @return  The current object associated with the specified parameter or 
     *   null if no object has been associated or if the 
     *   parameter is not supported. 
     * @exception DOMException
     *    NOT_FOUND_ERR: Raised when the parameter name is not recognized. 
     */
    public Object getParameter(String name)
                               throws DOMException;

    /**
     * Check if setting a parameter to a specific value is supported.
     * @param name The name of the parameter to check.
     * @param value  An object. if null, the returned value is 
     *   true. 
     * @return  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. 
     */
    public boolean canSetParameter(String name, 
                                   Object value);

    /**
     *  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. 
     */
    public DOMStringList getParameterNames();

}