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1 /*
2  * Copyright (c) 2004 World Wide Web Consortium,
3  *
4  * (Massachusetts Institute of Technology, European Research Consortium for
5  * Informatics and Mathematics, Keio University). All Rights Reserved. This
6  * work is distributed under the W3C(r) Software License [1] in the hope that
7  * it will be useful, but WITHOUT ANY WARRANTY; without even the implied
8  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
9  *
10  * [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
11  */

12
13 package org.w3c.dom;
14
15 /**
16  * The <code>TypeInfo</code> interface represents a type referenced from
17  * <code>Element</code> or <code>Attr</code> nodes, specified in the schemas
18  * associated with the document. The type is a pair of a namespace URI and
19  * name properties, and depends on the document's schema.
20  * <p> If the document's schema is an XML DTD [<a HREF='http://www.w3.org/TR/2004/REC-xml-20040204'>XML 1.0</a>], the values
21  * are computed as follows:
22  * <ul>
23  * <li> If this type is referenced from an
24  * <code>Attr</code> node, <code>typeNamespace</code> is
25  * <code>"http://www.w3.org/TR/REC-xml"</code> and <code>typeName</code>
26  * represents the <b>[attribute type]</b> property in the [<a HREF='http://www.w3.org/TR/2004/REC-xml-infoset-20040204/'>XML Information Set</a>]
27  * . If there is no declaration for the attribute, <code>typeNamespace</code>
28  * and <code>typeName</code> are <code>null</code>.
29  * </li>
30  * <li> If this type is
31  * referenced from an <code>Element</code> node, <code>typeNamespace</code>
32  * and <code>typeName</code> are <code>null</code>.
33  * </li>
34  * </ul>
35  * <p> If the document's schema is an XML Schema [<a HREF='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/'>XML Schema Part 1</a>]
36  * , the values are computed as follows using the post-schema-validation
37  * infoset contributions (also called PSVI contributions):
38  * <ul>
39  * <li> If the <b>[validity]</b> property exists AND is <em>"invalid"</em> or <em>"notKnown"</em>: the {target namespace} and {name} properties of the declared type if
40  * available, otherwise <code>null</code>.
41  * <p ><b>Note:</b> At the time of writing, the XML Schema specification does
42  * not require exposing the declared type. Thus, DOM implementations might
43  * choose not to provide type information if validity is not valid.
44  * </li>
45  * <li> If the <b>[validity]</b> property exists and is <em>"valid"</em>:
46  * <ol>
47  * <li> If <b>[member type definition]</b> exists:
48  * <ol>
49  * <li>If {name} is not absent, then expose {name} and {target
50  * namespace} properties of the <b>[member type definition]</b> property;
51  * </li>
52  * <li>Otherwise, expose the namespace and local name of the
53  * corresponding anonymous type name.
54  * </li>
55  * </ol>
56  * </li>
57  * <li> If the <b>[type definition]</b> property exists:
58  * <ol>
59  * <li>If {name} is not absent, then expose {name} and {target
60  * namespace} properties of the <b>[type definition]</b> property;
61  * </li>
62  * <li>Otherwise, expose the namespace and local name of the
63  * corresponding anonymous type name.
64  * </li>
65  * </ol>
66  * </li>
67  * <li> If the <b>[member type definition anonymous]</b> exists:
68  * <ol>
69  * <li>If it is false, then expose <b>[member type definition name]</b> and <b>[member type definition namespace]</b> properties;
70  * </li>
71  * <li>Otherwise, expose the namespace and local name of the
72  * corresponding anonymous type name.
73  * </li>
74  * </ol>
75  * </li>
76  * <li> If the <b>[type definition anonymous]</b> exists:
77  * <ol>
78  * <li>If it is false, then expose <b>[type definition name]</b> and <b>[type definition namespace]</b> properties;
79  * </li>
80  * <li>Otherwise, expose the namespace and local name of the
81  * corresponding anonymous type name.
82  * </li>
83  * </ol>
84  * </li>
85  * </ol>
86  * </li>
87  * </ul>
88  * <p ><b>Note:</b> Other schema languages are outside the scope of the W3C
89  * and therefore should define how to represent their type systems using
90  * <code>TypeInfo</code>.
91  * <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>.
92  * @since DOM Level 3
93  */

94 public interface TypeInfo {
95     /**
96      * The name of a type declared for the associated element or attribute,
97      * or <code>null</code> if unknown.
98      */

99     public String JavaDoc getTypeName();
100
101     /**
102      * The namespace of the type declared for the associated element or
103      * attribute or <code>null</code> if the element does not have
104      * declaration or if no namespace information is available.
105      */

106     public String JavaDoc getTypeNamespace();
107
108     // DerivationMethods
109
/**
110      * If the document's schema is an XML Schema [<a HREF='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/'>XML Schema Part 1</a>]
111      * , this constant represents the derivation by <a HREF='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#key-typeRestriction'>
112      * restriction</a> if complex types are involved, or a <a HREF='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#element-restriction'>
113      * restriction</a> if simple types are involved.
114      * <br> The reference type definition is derived by restriction from the
115      * other type definition if the other type definition is the same as the
116      * reference type definition, or if the other type definition can be
117      * reached recursively following the {base type definition} property
118      * from the reference type definition, and all the <em>derivation methods</em> involved are restriction.
119      */

120     public static final int DERIVATION_RESTRICTION = 0x00000001;
121     /**
122      * If the document's schema is an XML Schema [<a HREF='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/'>XML Schema Part 1</a>]
123      * , this constant represents the derivation by <a HREF='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#key-typeExtension'>
124      * extension</a>.
125      * <br> The reference type definition is derived by extension from the
126      * other type definition if the other type definition can be reached
127      * recursively following the {base type definition} property from the
128      * reference type definition, and at least one of the <em>derivation methods</em> involved is an extension.
129      */

130     public static final int DERIVATION_EXTENSION = 0x00000002;
131     /**
132      * If the document's schema is an XML Schema [<a HREF='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/'>XML Schema Part 1</a>]
133      * , this constant represents the <a HREF='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#element-union'>
134      * union</a> if simple types are involved.
135      * <br> The reference type definition is derived by union from the other
136      * type definition if there exists two type definitions T1 and T2 such
137      * as the reference type definition is derived from T1 by
138      * <code>DERIVATION_RESTRICTION</code> or
139      * <code>DERIVATION_EXTENSION</code>, T2 is derived from the other type
140      * definition by <code>DERIVATION_RESTRICTION</code>, T1 has {variety} <em>union</em>, and one of the {member type definitions} is T2. Note that T1 could be
141      * the same as the reference type definition, and T2 could be the same
142      * as the other type definition.
143      */

144     public static final int DERIVATION_UNION = 0x00000004;
145     /**
146      * If the document's schema is an XML Schema [<a HREF='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/'>XML Schema Part 1</a>]
147      * , this constant represents the <a HREF='http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#element-list'>list</a>.
148      * <br> The reference type definition is derived by list from the other
149      * type definition if there exists two type definitions T1 and T2 such
150      * as the reference type definition is derived from T1 by
151      * <code>DERIVATION_RESTRICTION</code> or
152      * <code>DERIVATION_EXTENSION</code>, T2 is derived from the other type
153      * definition by <code>DERIVATION_RESTRICTION</code>, T1 has {variety} <em>list</em>, and T2 is the {item type definition}. Note that T1 could be the same as
154      * the reference type definition, and T2 could be the same as the other
155      * type definition.
156      */

157     public static final int DERIVATION_LIST = 0x00000008;
158
159     /**
160      * This method returns if there is a derivation between the reference
161      * type definition, i.e. the <code>TypeInfo</code> on which the method
162      * is being called, and the other type definition, i.e. the one passed
163      * as parameters.
164      * @param typeNamespaceArg the namespace of the other type definition.
165      * @param typeNameArg the name of the other type definition.
166      * @param derivationMethod the type of derivation and conditions applied
167      * between two types, as described in the list of constants provided
168      * in this interface.
169      * @return If the document's schema is a DTD or no schema is associated
170      * with the document, this method will always return <code>false</code>
171      * . If the document's schema is an XML Schema, the method will
172      * <code>true</code> if the reference type definition is derived from
173      * the other type definition according to the derivation parameter. If
174      * the value of the parameter is <code>0</code> (no bit is set to
175      * <code>1</code> for the <code>derivationMethod</code> parameter),
176      * the method will return <code>true</code> if the other type
177      * definition can be reached by recursing any combination of {base
178      * type definition}, {item type definition}, or {member type
179      * definitions} from the reference type definition.
180      */

181     public boolean isDerivedFrom(String JavaDoc typeNamespaceArg,
182                                  String JavaDoc typeNameArg,
183                                  int derivationMethod);
184
185 }
186
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