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<H2><A NAME="SECTION0015540000000000000000"></A><A NAME="expat-content-models"></A>
<BR>
13.5.4 Content Model Descriptions 
</H2>

<P>
Content modules are described using nested tuples.  Each tuple
contains four values: the type, the quantifier, the name, and a tuple
of children.  Children are simply additional content module
descriptions.

<P>
The values of the first two fields are constants defined in the
<code>model</code> object of the <tt class="module">xml.parsers.expat</tt> module.  These
constants can be collected in two groups: the model type group and the
quantifier group.

<P>
The constants in the model type group are:

<P>
<dl><dt><b><tt>XML_CTYPE_ANY</tt></b></dt>
<dd>
The element named by the model name was declared to have a content
model of <code>ANY</code>.
</dd></dl>

<P>
<dl><dt><b><tt>XML_CTYPE_CHOICE</tt></b></dt>
<dd>
The named element allows a choice from a number of options; this is
used for content models such as <code>(A | B | C)</code>.
</dd></dl>

<P>
<dl><dt><b><tt>XML_CTYPE_EMPTY</tt></b></dt>
<dd>
Elements which are declared to be <code>EMPTY</code> have this model type.
</dd></dl>

<P>
<dl><dt><b><tt>XML_CTYPE_MIXED</tt></b></dt>
<dd>
</dd></dl>

<P>
<dl><dt><b><tt>XML_CTYPE_NAME</tt></b></dt>
<dd>
</dd></dl>

<P>
<dl><dt><b><tt>XML_CTYPE_SEQ</tt></b></dt>
<dd>
Models which represent a series of models which follow one after the
other are indicated with this model type.  This is used for models
such as <code>(A, B, C)</code>.
</dd></dl>

<P>
The constants in the quantifier group are:

<P>
<dl><dt><b><tt>XML_CQUANT_NONE</tt></b></dt>
<dd>
No modifier is given, so it can appear exactly once, as for <code>A</code>.
</dd></dl>

<P>
<dl><dt><b><tt>XML_CQUANT_OPT</tt></b></dt>
<dd>
The model is optional: it can appear once or not at all, as for
<code>A?</code>.
</dd></dl>

<P>
<dl><dt><b><tt>XML_CQUANT_PLUS</tt></b></dt>
<dd>
The model must occur one or more times (like <code>A+</code>).
</dd></dl>

<P>
<dl><dt><b><tt>XML_CQUANT_REP</tt></b></dt>
<dd>
The model must occur zero or more times, as for <code>A*</code>.
</dd></dl>

<P>

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	54
	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>
140
141	<P>
142
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