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55 | <H2><A NAME="SECTION0015540000000000000000"></A><A NAME="expat-content-models"></A> | |
56 | <BR> | |
57 | 13.5.4 Content Model Descriptions | |
58 | </H2> | |
59 | ||
60 | <P> | |
61 | Content modules are described using nested tuples. Each tuple | |
62 | contains four values: the type, the quantifier, the name, and a tuple | |
63 | of children. Children are simply additional content module | |
64 | descriptions. | |
65 | ||
66 | <P> | |
67 | The values of the first two fields are constants defined in the | |
68 | <code>model</code> object of the <tt class="module">xml.parsers.expat</tt> module. These | |
69 | constants can be collected in two groups: the model type group and the | |
70 | quantifier group. | |
71 | ||
72 | <P> | |
73 | The constants in the model type group are: | |
74 | ||
75 | <P> | |
76 | <dl><dt><b><tt>XML_CTYPE_ANY</tt></b></dt> | |
77 | <dd> | |
78 | The element named by the model name was declared to have a content | |
79 | model of <code>ANY</code>. | |
80 | </dd></dl> | |
81 | ||
82 | <P> | |
83 | <dl><dt><b><tt>XML_CTYPE_CHOICE</tt></b></dt> | |
84 | <dd> | |
85 | The named element allows a choice from a number of options; this is | |
86 | used for content models such as <code>(A | B | C)</code>. | |
87 | </dd></dl> | |
88 | ||
89 | <P> | |
90 | <dl><dt><b><tt>XML_CTYPE_EMPTY</tt></b></dt> | |
91 | <dd> | |
92 | Elements which are declared to be <code>EMPTY</code> have this model type. | |
93 | </dd></dl> | |
94 | ||
95 | <P> | |
96 | <dl><dt><b><tt>XML_CTYPE_MIXED</tt></b></dt> | |
97 | <dd> | |
98 | </dd></dl> | |
99 | ||
100 | <P> | |
101 | <dl><dt><b><tt>XML_CTYPE_NAME</tt></b></dt> | |
102 | <dd> | |
103 | </dd></dl> | |
104 | ||
105 | <P> | |
106 | <dl><dt><b><tt>XML_CTYPE_SEQ</tt></b></dt> | |
107 | <dd> | |
108 | Models which represent a series of models which follow one after the | |
109 | other are indicated with this model type. This is used for models | |
110 | such as <code>(A, B, C)</code>. | |
111 | </dd></dl> | |
112 | ||
113 | <P> | |
114 | The constants in the quantifier group are: | |
115 | ||
116 | <P> | |
117 | <dl><dt><b><tt>XML_CQUANT_NONE</tt></b></dt> | |
118 | <dd> | |
119 | No modifier is given, so it can appear exactly once, as for <code>A</code>. | |
120 | </dd></dl> | |
121 | ||
122 | <P> | |
123 | <dl><dt><b><tt>XML_CQUANT_OPT</tt></b></dt> | |
124 | <dd> | |
125 | The model is optional: it can appear once or not at all, as for | |
126 | <code>A?</code>. | |
127 | </dd></dl> | |
128 | ||
129 | <P> | |
130 | <dl><dt><b><tt>XML_CQUANT_PLUS</tt></b></dt> | |
131 | <dd> | |
132 | The model must occur one or more times (like <code>A+</code>). | |
133 | </dd></dl> | |
134 | ||
135 | <P> | |
136 | <dl><dt><b><tt>XML_CQUANT_REP</tt></b></dt> | |
137 | <dd> | |
138 | The model must occur zero or more times, as for <code>A*</code>. | |
139 | </dd></dl> | |
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