001/*
002 * Copyright (c) 2004 World Wide Web Consortium,
003 *
004 * (Massachusetts Institute of Technology, European Research Consortium for
005 * Informatics and Mathematics, Keio University). All Rights Reserved. This
006 * work is distributed under the W3C(r) Software License [1] in the hope that
007 * it will be useful, but WITHOUT ANY WARRANTY; without even the implied
008 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
009 *
010 * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
011 */
012
013package org.w3c.dom;
014
015/**
016 *  The <code>DOMConfiguration</code> interface represents the configuration 
017 * of a document and maintains a table of recognized parameters. Using the 
018 * configuration, it is possible to change 
019 * <code>Document.normalizeDocument()</code> behavior, such as replacing the 
020 * <code>CDATASection</code> nodes with <code>Text</code> nodes or 
021 * specifying the type of the schema that must be used when the validation 
022 * of the <code>Document</code> is requested. <code>DOMConfiguration</code> 
023 * objects are also used in [<a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-LS-20040407'>DOM Level 3 Load and Save</a>]
024 *  in the <code>DOMParser</code> and <code>DOMSerializer</code> interfaces. 
025 * <p> The parameter names used by the <code>DOMConfiguration</code> object 
026 * are defined throughout the DOM Level 3 specifications. Names are 
027 * case-insensitive. To avoid possible conflicts, as a convention, names 
028 * referring to parameters defined outside the DOM specification should be 
029 * made unique. Because parameters are exposed as properties in the , names 
030 * are recommended to follow the section 5.16 Identifiers of [Unicode] with the addition of the character '-' (HYPHEN-MINUS) but it is not 
031 * enforced by the DOM implementation. DOM Level 3 Core Implementations are 
032 * required to recognize all parameters defined in this specification. Some 
033 * parameter values may also be required to be supported by the 
034 * implementation. Refer to the definition of the parameter to know if a 
035 * value must be supported or not. 
036 * <p ><b>Note:</b>  Parameters are similar to features and properties used in 
037 * SAX2 [<a href='http://www.saxproject.org/'>SAX</a>]. 
038 * <p> The following list of parameters defined in the DOM: 
039 * <dl>
040 * <dt>
041 * <code>"canonical-form"</code></dt>
042 * <dd>
043 * <dl>
044 * <dt><code>true</code></dt>
045 * <dd>[<em>optional</em>] Canonicalize the document according to the rules specified in [<a href='http://www.w3.org/TR/2001/REC-xml-c14n-20010315'>Canonical XML</a>], 
046 * such as removing the <code>DocumentType</code> node (if any) from the 
047 * tree, or removing superfluous namespace declarations from each element. 
048 * Note that this is limited to what can be represented in the DOM; in 
049 * particular, there is no way to specify the order of the attributes in the 
050 * DOM. In addition,  Setting this parameter to <code>true</code> will also 
051 * set the state of the parameters listed below. Later changes to the state 
052 * of one of those parameters will revert "canonical-form" back to 
053 * <code>false</code>. Parameters set to <code>false</code>: "entities", "
054 * normalize-characters", "cdata-sections". Parameters set to 
055 * <code>true</code>: "namespaces", "namespace-declarations", "well-formed", 
056 * "element-content-whitespace". Other parameters are not changed unless 
057 * explicitly specified in the description of the parameters.</dd>
058 * <dt>
059 * <code>false</code></dt>
060 * <dd>[<em>required</em>] (<em>default</em>)Do not canonicalize the document.</dd>
061 * </dl></dd>
062 * <dt><code>"cdata-sections"</code></dt>
063 * <dd>
064 * <dl>
065 * <dt>
066 * <code>true</code></dt>
067 * <dd>[<em>required</em>] (<em>default</em>)Keep <code>CDATASection</code> nodes in the document.</dd>
068 * <dt><code>false</code></dt>
069 * <dd>[<em>required</em>]Transform <code>CDATASection</code> nodes in the document into 
070 * <code>Text</code> nodes. The new <code>Text</code> node is then combined 
071 * with any adjacent <code>Text</code> node.</dd>
072 * </dl></dd>
073 * <dt>
074 * <code>"check-character-normalization"</code></dt>
075 * <dd>
076 * <dl>
077 * <dt><code>true</code></dt>
078 * <dd>[<em>optional</em>] Check if the characters in the document are <a href='http://www.w3.org/TR/2004/REC-xml11-20040204/#dt-fullnorm'>fully 
079 * normalized</a>, as defined in appendix B of [<a href='http://www.w3.org/TR/2004/REC-xml11-20040204/'>XML 1.1</a>]. When a 
080 * sequence of characters is encountered that fails normalization checking, 
081 * an error with the <code>DOMError.type</code> equals to 
082 * "check-character-normalization-failure" is issued. </dd>
083 * <dt><code>false</code></dt>
084 * <dd>[<em>required</em>] (<em>default</em>)Do not check if characters are normalized.</dd>
085 * </dl></dd>
086 * <dt><code>"comments"</code></dt>
087 * <dd>
088 * <dl>
089 * <dt>
090 * <code>true</code></dt>
091 * <dd>[<em>required</em>] (<em>default</em>)Keep <code>Comment</code> nodes in the document.</dd>
092 * <dt><code>false</code></dt>
093 * <dd>[<em>required</em>]Discard <code>Comment</code> nodes in the document.</dd>
094 * </dl></dd>
095 * <dt>
096 * <code>"datatype-normalization"</code></dt>
097 * <dd>
098 * <dl>
099 * <dt><code>true</code></dt>
100 * <dd>[<em>optional</em>] Expose schema normalized values in the tree, such as <a href='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#key-nv'>XML 
101 * Schema normalized values</a> in the case of XML Schema. Since this parameter requires to have schema 
102 * information, the "validate" parameter will also be set to 
103 * <code>true</code>. Having this parameter activated when "validate" is 
104 * <code>false</code> has no effect and no schema-normalization will happen. 
105 * <p ><b>Note:</b>  Since the document contains the result of the XML 1.0 
106 * processing, this parameter does not apply to attribute value 
107 * normalization as defined in section 3.3.3 of [<a href='http://www.w3.org/TR/2004/REC-xml-20040204'>XML 1.0</a>] and is only 
108 * meant for schema languages other than Document Type Definition (DTD). </dd>
109 * <dt>
110 * <code>false</code></dt>
111 * <dd>[<em>required</em>] (<em>default</em>) Do not perform schema normalization on the tree. </dd>
112 * </dl></dd>
113 * <dt>
114 * <code>"element-content-whitespace"</code></dt>
115 * <dd>
116 * <dl>
117 * <dt><code>true</code></dt>
118 * <dd>[<em>required</em>] (<em>default</em>)Keep all whitespaces in the document.</dd>
119 * <dt><code>false</code></dt>
120 * <dd>[<em>optional</em>] Discard all <code>Text</code> nodes that contain whitespaces in element 
121 * content, as described in <a href='http://www.w3.org/TR/2004/REC-xml-infoset-20040204#infoitem.character'>
122 * [element content whitespace]</a>. The implementation is expected to use the attribute 
123 * <code>Text.isElementContentWhitespace</code> to determine if a 
124 * <code>Text</code> node should be discarded or not.</dd>
125 * </dl></dd>
126 * <dt><code>"entities"</code></dt>
127 * <dd>
128 * <dl>
129 * <dt>
130 * <code>true</code></dt>
131 * <dd>[<em>required</em>] (<em>default</em>)Keep <code>EntityReference</code> nodes in the document.</dd>
132 * <dt>
133 * <code>false</code></dt>
134 * <dd>[<em>required</em>] Remove all <code>EntityReference</code> nodes from the document, 
135 * putting the entity expansions directly in their place. <code>Text</code> 
136 * nodes are normalized, as defined in <code>Node.normalize</code>. Only <a href='http://www.w3.org/TR/2004/REC-xml-infoset-20040204/#infoitem.rse'>
137 * unexpanded entity references</a> are kept in the document. </dd>
138 * </dl>
139 * <p ><b>Note:</b>  This parameter does not affect <code>Entity</code> nodes. </dd>
140 * <dt>
141 * <code>"error-handler"</code></dt>
142 * <dd>[<em>required</em>] Contains a <code>DOMErrorHandler</code> object. If an error is 
143 * encountered in the document, the implementation will call back the 
144 * <code>DOMErrorHandler</code> registered using this parameter. The 
145 * implementation may provide a default <code>DOMErrorHandler</code> object. 
146 *  When called, <code>DOMError.relatedData</code> will contain the closest 
147 * node to where the error occurred. If the implementation is unable to 
148 * determine the node where the error occurs, 
149 * <code>DOMError.relatedData</code> will contain the <code>Document</code> 
150 * node. Mutations to the document from within an error handler will result 
151 * in implementation dependent behavior. </dd>
152 * <dt><code>"infoset"</code></dt>
153 * <dd>
154 * <dl>
155 * <dt>
156 * <code>true</code></dt>
157 * <dd>[<em>required</em>]Keep in the document the information defined in the XML Information Set [<a href='http://www.w3.org/TR/2004/REC-xml-infoset-20040204/'>XML Information Set</a>]
158 * .This forces the following parameters to <code>false</code>: "
159 * validate-if-schema", "entities", "datatype-normalization", "cdata-sections
160 * ".This forces the following parameters to <code>true</code>: "
161 * namespace-declarations", "well-formed", "element-content-whitespace", "
162 * comments", "namespaces".Other parameters are not changed unless 
163 * explicitly specified in the description of the parameters. Note that 
164 * querying this parameter with <code>getParameter</code> returns 
165 * <code>true</code> only if the individual parameters specified above are 
166 * appropriately set.</dd>
167 * <dt><code>false</code></dt>
168 * <dd>Setting <code>infoset</code> to 
169 * <code>false</code> has no effect.</dd>
170 * </dl></dd>
171 * <dt><code>"namespaces"</code></dt>
172 * <dd>
173 * <dl>
174 * <dt>
175 * <code>true</code></dt>
176 * <dd>[<em>required</em>] (<em>default</em>) Perform the namespace processing as defined in . </dd>
177 * <dt><code>false</code></dt>
178 * <dd>[<em>optional</em>] Do not perform the namespace processing. </dd>
179 * </dl></dd>
180 * <dt>
181 * <code>"namespace-declarations"</code></dt>
182 * <dd> This parameter has no effect if the 
183 * parameter "namespaces" is set to <code>false</code>. 
184 * <dl>
185 * <dt><code>true</code></dt>
186 * <dd>[<em>required</em>] (<em>default</em>) Include namespace declaration attributes, specified or defaulted from 
187 * the schema, in the document. See also the sections "Declaring Namespaces" 
188 * in [<a href='http://www.w3.org/TR/1999/REC-xml-names-19990114/'>XML Namespaces</a>]
189 *  and [<a href='http://www.w3.org/TR/2004/REC-xml-names11-20040204/'>XML Namespaces 1.1</a>]
190 * .</dd>
191 * <dt><code>false</code></dt>
192 * <dd>[<em>required</em>]Discard all namespace declaration attributes. The namespace prefixes (
193 * <code>Node.prefix</code>) are retained even if this parameter is set to 
194 * <code>false</code>.</dd>
195 * </dl></dd>
196 * <dt><code>"normalize-characters"</code></dt>
197 * <dd>
198 * <dl>
199 * <dt><code>true</code></dt>
200 * <dd>[<em>optional</em>] <a href='http://www.w3.org/TR/2004/REC-xml11-20040204/#dt-fullnorm'>Fully 
201 * normalized</a> the characters in the document as defined in appendix B of [<a href='http://www.w3.org/TR/2004/REC-xml11-20040204/'>XML 1.1</a>]. </dd>
202 * <dt>
203 * <code>false</code></dt>
204 * <dd>[<em>required</em>] (<em>default</em>)Do not perform character normalization.</dd>
205 * </dl></dd>
206 * <dt><code>"schema-location"</code></dt>
207 * <dd>[<em>optional</em>] Represent a <code>DOMString</code> object containing a list of URIs, 
208 * separated by whitespaces (characters matching the <a href='http://www.w3.org/TR/2004/REC-xml-20040204#NT-S'>nonterminal 
209 * production S</a> defined in section 2.3 [<a href='http://www.w3.org/TR/2004/REC-xml-20040204'>XML 1.0</a>]), that 
210 * represents the schemas against which validation should occur, i.e. the 
211 * current schema. The types of schemas referenced in this list must match 
212 * the type specified with <code>schema-type</code>, otherwise the behavior 
213 * of an implementation is undefined.  The schemas specified using this 
214 * property take precedence to the schema information specified in the 
215 * document itself. For namespace aware schema, if a schema specified using 
216 * this property and a schema specified in the document instance (i.e. using 
217 * the <code>schemaLocation</code> attribute) in a schema document (i.e. 
218 * using schema <code>import</code> mechanisms) share the same 
219 * <code>targetNamespace</code>, the schema specified by the user using this 
220 * property will be used. If two schemas specified using this property share 
221 * the same <code>targetNamespace</code> or have no namespace, the behavior 
222 * is implementation dependent.  If no location has been provided, this 
223 * parameter is <code>null</code>. 
224 * <p ><b>Note:</b>  The <code>"schema-location"</code> parameter is ignored 
225 * unless the "schema-type" parameter value is set. It is strongly 
226 * recommended that <code>Document.documentURI</code> will be set so that an 
227 * implementation can successfully resolve any external entities referenced. </dd>
228 * <dt>
229 * <code>"schema-type"</code></dt>
230 * <dd>[<em>optional</em>] Represent a <code>DOMString</code> object containing an absolute URI 
231 * and representing the type of the schema language used to validate a 
232 * document against. Note that no lexical checking is done on the absolute 
233 * URI.  If this parameter is not set, a default value may be provided by 
234 * the implementation, based on the schema languages supported and on the 
235 * schema language used at load time. If no value is provided, this 
236 * parameter is <code>null</code>. 
237 * <p ><b>Note:</b>  For XML Schema [<a href='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/'>XML Schema Part 1</a>]
238 * , applications must use the value 
239 * <code>"http://www.w3.org/2001/XMLSchema"</code>. For XML DTD [<a href='http://www.w3.org/TR/2004/REC-xml-20040204'>XML 1.0</a>], 
240 * applications must use the value 
241 * <code>"http://www.w3.org/TR/REC-xml"</code>. Other schema languages are 
242 * outside the scope of the W3C and therefore should recommend an absolute 
243 * URI in order to use this method. </dd>
244 * <dt><code>"split-cdata-sections"</code></dt>
245 * <dd>
246 * <dl>
247 * <dt>
248 * <code>true</code></dt>
249 * <dd>[<em>required</em>] (<em>default</em>)Split CDATA sections containing the CDATA section termination marker 
250 * ']]&gt;'. When a CDATA section is split a warning is issued with a 
251 * <code>DOMError.type</code> equals to 
252 * <code>"cdata-sections-splitted"</code> and 
253 * <code>DOMError.relatedData</code> equals to the first 
254 * <code>CDATASection</code> node in document order resulting from the split.</dd>
255 * <dt>
256 * <code>false</code></dt>
257 * <dd>[<em>required</em>]Signal an error if a <code>CDATASection</code> contains an 
258 * unrepresentable character.</dd>
259 * </dl></dd>
260 * <dt><code>"validate"</code></dt>
261 * <dd>
262 * <dl>
263 * <dt><code>true</code></dt>
264 * <dd>[<em>optional</em>] Require the validation against a schema (i.e. XML schema, DTD, any 
265 * other type or representation of schema) of the document as it is being 
266 * normalized as defined by [<a href='http://www.w3.org/TR/2004/REC-xml-20040204'>XML 1.0</a>]. If 
267 * validation errors are found, or no schema was found, the error handler is 
268 * notified. Schema-normalized values will not be exposed according to the 
269 * schema in used unless the parameter "datatype-normalization" is 
270 * <code>true</code>.  This parameter will reevaluate: 
271 * <ul>
272 * <li> Attribute nodes with 
273 * <code>Attr.specified</code> equals to <code>false</code>, as specified in 
274 * the description of the <code>Attr</code> interface; 
275 * </li>
276 * <li> The value of the 
277 * attribute <code>Text.isElementContentWhitespace</code> for all 
278 * <code>Text</code> nodes; 
279 * </li>
280 * <li> The value of the attribute 
281 * <code>Attr.isId</code> for all <code>Attr</code> nodes; 
282 * </li>
283 * <li> The attributes 
284 * <code>Element.schemaTypeInfo</code> and <code>Attr.schemaTypeInfo</code>. 
285 * </li>
286 * </ul>
287 * <p ><b>Note:</b>  "validate-if-schema" and "validate" are mutually 
288 * exclusive, setting one of them to <code>true</code> will set the other 
289 * one to <code>false</code>. Applications should also consider setting the 
290 * parameter "well-formed" to <code>true</code>, which is the default for 
291 * that option, when validating the document. </dd>
292 * <dt><code>false</code></dt>
293 * <dd>[<em>required</em>] (<em>default</em>) Do not accomplish schema processing, including the internal subset 
294 * processing. Default attribute values information are kept. Note that 
295 * validation might still happen if "validate-if-schema" is <code>true</code>
296 * . </dd>
297 * </dl></dd>
298 * <dt><code>"validate-if-schema"</code></dt>
299 * <dd>
300 * <dl>
301 * <dt><code>true</code></dt>
302 * <dd>[<em>optional</em>]Enable validation only if a declaration for the document element can be 
303 * found in a schema (independently of where it is found, i.e. XML schema, 
304 * DTD, or any other type or representation of schema). If validation is 
305 * enabled, this parameter has the same behavior as the parameter "validate" 
306 * set to <code>true</code>. 
307 * <p ><b>Note:</b>  "validate-if-schema" and "validate" are mutually 
308 * exclusive, setting one of them to <code>true</code> will set the other 
309 * one to <code>false</code>. </dd>
310 * <dt><code>false</code></dt>
311 * <dd>[<em>required</em>] (<em>default</em>) No schema processing should be performed if the document has a schema, 
312 * including internal subset processing. Default attribute values 
313 * information are kept. Note that validation must still happen if "validate
314 * " is <code>true</code>. </dd>
315 * </dl></dd>
316 * <dt><code>"well-formed"</code></dt>
317 * <dd>
318 * <dl>
319 * <dt><code>true</code></dt>
320 * <dd>[<em>required</em>] (<em>default</em>) Check if all nodes are XML well formed according to the XML version in 
321 * use in <code>Document.xmlVersion</code>: 
322 * <ul>
323 * <li> check if the attribute 
324 * <code>Node.nodeName</code> contains invalid characters according to its 
325 * node type and generate a <code>DOMError</code> of type 
326 * <code>"wf-invalid-character-in-node-name"</code>, with a 
327 * <code>DOMError.SEVERITY_ERROR</code> severity, if necessary; 
328 * </li>
329 * <li> check if 
330 * the text content inside <code>Attr</code>, <code>Element</code>, 
331 * <code>Comment</code>, <code>Text</code>, <code>CDATASection</code> nodes 
332 * for invalid characters and generate a <code>DOMError</code> of type 
333 * <code>"wf-invalid-character"</code>, with a 
334 * <code>DOMError.SEVERITY_ERROR</code> severity, if necessary; 
335 * </li>
336 * <li> check if 
337 * the data inside <code>ProcessingInstruction</code> nodes for invalid 
338 * characters and generate a <code>DOMError</code> of type 
339 * <code>"wf-invalid-character"</code>, with a 
340 * <code>DOMError.SEVERITY_ERROR</code> severity, if necessary; 
341 * </li>
342 * </ul></dd>
343 * <dt>
344 * <code>false</code></dt>
345 * <dd>[<em>optional</em>] Do not check for XML well-formedness. </dd>
346 * </dl></dd>
347 * </dl>
348 * <p> The resolution of the system identifiers associated with entities is 
349 * done using <code>Document.documentURI</code>. However, when the feature 
350 * "LS" defined in [<a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-LS-20040407'>DOM Level 3 Load and Save</a>]
351 *  is supported by the DOM implementation, the parameter 
352 * "resource-resolver" can also be used on <code>DOMConfiguration</code> 
353 * objects attached to <code>Document</code> nodes. If this parameter is 
354 * set, <code>Document.normalizeDocument()</code> will invoke the resource 
355 * resolver instead of using <code>Document.documentURI</code>. 
356 * <p>See also the <a href='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407'>Document Object Model (DOM) Level 3 Core Specification</a>.
357 * @since DOM Level 3
358 */
359public interface DOMConfiguration {
360    /**
361     * Set the value of a parameter.
362     * @param name The name of the parameter to set.
363     * @param value  The new value or <code>null</code> if the user wishes to 
364     *   unset the parameter. While the type of the value parameter is 
365     *   defined as <code>DOMUserData</code>, the object type must match the 
366     *   type defined by the definition of the parameter. For example, if 
367     *   the parameter is "error-handler", the value must be of type 
368     *   <code>DOMErrorHandler</code>. 
369     * @exception DOMException
370     *    NOT_FOUND_ERR: Raised when the parameter name is not recognized. 
371     *   <br> NOT_SUPPORTED_ERR: Raised when the parameter name is recognized 
372     *   but the requested value cannot be set. 
373     *   <br> TYPE_MISMATCH_ERR: Raised if the value type for this parameter 
374     *   name is incompatible with the expected value type. 
375     */
376    public void setParameter(String name, 
377                             Object value)
378                             throws DOMException;
379
380    /**
381     *  Return the value of a parameter if known. 
382     * @param name  The name of the parameter. 
383     * @return  The current object associated with the specified parameter or 
384     *   <code>null</code> if no object has been associated or if the 
385     *   parameter is not supported. 
386     * @exception DOMException
387     *    NOT_FOUND_ERR: Raised when the parameter name is not recognized. 
388     */
389    public Object getParameter(String name)
390                               throws DOMException;
391
392    /**
393     * Check if setting a parameter to a specific value is supported.
394     * @param name The name of the parameter to check.
395     * @param value  An object. if <code>null</code>, the returned value is 
396     *   <code>true</code>. 
397     * @return  <code>true</code> if the parameter could be successfully set 
398     *   to the specified value, or <code>false</code> if the parameter is 
399     *   not recognized or the requested value is not supported. This does 
400     *   not change the current value of the parameter itself. 
401     */
402    public boolean canSetParameter(String name, 
403                                   Object value);
404
405    /**
406     *  The list of the parameters supported by this 
407     * <code>DOMConfiguration</code> object and for which at least one value 
408     * can be set by the application. Note that this list can also contain 
409     * parameter names defined outside this specification. 
410     */
411    public DOMStringList getParameterNames();
412
413}