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<H1><A NAME="SECTION0061100000000000000000">
4.11 <tt class="module">stringprep</tt> --
         Internet String Preparation</A>
</H1>

<P>
<A NAME="module-stringprep"></A>

<P>
When identifying things (such as host names) in the internet, it is
often necessary to compare such identifications for
``equality''. Exactly how this comparison is executed may depend on
the application domain, e.g. whether it should be case-insensitive or
not. It may be also necessary to restrict the possible
identifications, to allow only identifications consisting of
``printable'' characters.

<P>
<a class="rfc" id='rfcref-87139' xml:id='rfcref-87139'
href="http://www.faqs.org/rfcs/rfc3454.html">RFC 3454</a> defines a procedure for ``preparing'' Unicode strings in
internet protocols. Before passing strings onto the wire, they are
processed with the preparation procedure, after which they have a
certain normalized form. The RFC defines a set of tables, which can be
combined into profiles. Each profile must define which tables it uses,
and what other optional parts of the <code>stringprep</code> procedure are
part of the profile. One example of a <code>stringprep</code> profile is
<code>nameprep</code>, which is used for internationalized domain names.

<P>
The module <tt class="module">stringprep</tt> only exposes the tables from RFC
3454. As these tables would be very large to represent them as
dictionaries or lists, the module uses the Unicode character database
internally. The module source code itself was generated using the
<code>mkstringprep.py</code> utility.

<P>
As a result, these tables are exposed as functions, not as data
structures. There are two kinds of tables in the RFC: sets and
mappings. For a set, <tt class="module">stringprep</tt> provides the ``characteristic
function'', i.e. a function that returns true if the parameter is part
of the set. For mappings, it provides the mapping function: given the
key, it returns the associated value. Below is a list of all functions
available in the module.

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1039' xml:id='l2h-1039' class="function">in_table_a1</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableA.1 (Unassigned code points
in Unicode 3.2).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1040' xml:id='l2h-1040' class="function">in_table_b1</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableB.1 (Commonly mapped to
nothing).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1041' xml:id='l2h-1041' class="function">map_table_b2</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Return the mapped value for <var>code</var> according to tableB.2 
(Mapping for case-folding used with NFKC).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1042' xml:id='l2h-1042' class="function">map_table_b3</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Return the mapped value for <var>code</var> according to tableB.3 
(Mapping for case-folding used with no normalization).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1043' xml:id='l2h-1043' class="function">in_table_c11</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableC.1.1 
(ASCII space characters).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1044' xml:id='l2h-1044' class="function">in_table_c12</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableC.1.2 
(Non-ASCII space characters).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1045' xml:id='l2h-1045' class="function">in_table_c11_c12</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableC.1 
(Space characters, union of C.1.1 and C.1.2).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1046' xml:id='l2h-1046' class="function">in_table_c21</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableC.2.1 
(ASCII control characters).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1047' xml:id='l2h-1047' class="function">in_table_c22</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableC.2.2 
(Non-ASCII control characters).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1048' xml:id='l2h-1048' class="function">in_table_c21_c22</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableC.2 
(Control characters, union of C.2.1 and C.2.2).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1049' xml:id='l2h-1049' class="function">in_table_c3</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableC.3 
(Private use).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1050' xml:id='l2h-1050' class="function">in_table_c4</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableC.4 
(Non-character code points).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1051' xml:id='l2h-1051' class="function">in_table_c5</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableC.5 
(Surrogate codes).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1052' xml:id='l2h-1052' class="function">in_table_c6</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableC.6 
(Inappropriate for plain text).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1053' xml:id='l2h-1053' class="function">in_table_c7</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableC.7 
(Inappropriate for canonical representation).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1054' xml:id='l2h-1054' class="function">in_table_c8</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableC.8 
(Change display properties or are deprecated).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1055' xml:id='l2h-1055' class="function">in_table_c9</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableC.9 
(Tagging characters).
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1056' xml:id='l2h-1056' class="function">in_table_d1</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableD.1 
(Characters with bidirectional property ``R'' or ``AL'').
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-1057' xml:id='l2h-1057' class="function">in_table_d2</tt></b>(</nobr></td>
  <td><var>code</var>)</td></tr></table></dt>
<dd>
Determine whether <var>code</var> is in tableD.2 
(Characters with bidirectional property ``L'').
</dl>

<P>

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	53
	54	<H1><A NAME="SECTION0061100000000000000000">
	55	4.11 <tt class="module">stringprep</tt> --
	56	Internet String Preparation</A>
	57	</H1>
	58
	59	<P>
	60	<A NAME="module-stringprep"></A>
	61
	62	<P>
	63	When identifying things (such as host names) in the internet, it is
	64	often necessary to compare such identifications for
65	``equality''. Exactly how this comparison is executed may depend on
66	the application domain, e.g. whether it should be case-insensitive or
67	not. It may be also necessary to restrict the possible
68	identifications, to allow only identifications consisting of
69	``printable'' characters.
70
71	<P>
72	<a class="rfc" id='rfcref-87139' xml:id='rfcref-87139'
73	href="http://www.faqs.org/rfcs/rfc3454.html">RFC 3454</a> defines a procedure for ``preparing'' Unicode strings in
74	internet protocols. Before passing strings onto the wire, they are
75	processed with the preparation procedure, after which they have a
76	certain normalized form. The RFC defines a set of tables, which can be
77	combined into profiles. Each profile must define which tables it uses,
78	and what other optional parts of the <code>stringprep</code> procedure are
79	part of the profile. One example of a <code>stringprep</code> profile is
80	<code>nameprep</code>, which is used for internationalized domain names.
81
82	<P>
83	The module <tt class="module">stringprep</tt> only exposes the tables from RFC
84	3454. As these tables would be very large to represent them as
85	dictionaries or lists, the module uses the Unicode character database
86	internally. The module source code itself was generated using the
87	<code>mkstringprep.py</code> utility.
88
89	<P>
90	As a result, these tables are exposed as functions, not as data
91	structures. There are two kinds of tables in the RFC: sets and
92	mappings. For a set, <tt class="module">stringprep</tt> provides the ``characteristic
93	function'', i.e. a function that returns true if the parameter is part
94	of the set. For mappings, it provides the mapping function: given the
95	key, it returns the associated value. Below is a list of all functions
96	available in the module.
97
98	<P>
99	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
100	<td><nobr><b><tt id='l2h-1039' xml:id='l2h-1039' class="function">in_table_a1</tt></b>(</nobr></td>
101	<td><var>code</var>)</td></tr></table></dt>
102	<dd>
103	Determine whether <var>code</var> is in tableA.1 (Unassigned code points
104	in Unicode 3.2).
105	</dl>
106
107	<P>
108	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
109	<td><nobr><b><tt id='l2h-1040' xml:id='l2h-1040' class="function">in_table_b1</tt></b>(</nobr></td>
110	<td><var>code</var>)</td></tr></table></dt>
111	<dd>
112	Determine whether <var>code</var> is in tableB.1 (Commonly mapped to
113	nothing).
114	</dl>
115
116	<P>
117	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
118	<td><nobr><b><tt id='l2h-1041' xml:id='l2h-1041' class="function">map_table_b2</tt></b>(</nobr></td>
119	<td><var>code</var>)</td></tr></table></dt>
120	<dd>
121	Return the mapped value for <var>code</var> according to tableB.2
122	(Mapping for case-folding used with NFKC).
123	</dl>
124
125	<P>
126	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
127	<td><nobr><b><tt id='l2h-1042' xml:id='l2h-1042' class="function">map_table_b3</tt></b>(</nobr></td>
128	<td><var>code</var>)</td></tr></table></dt>
129	<dd>
130	Return the mapped value for <var>code</var> according to tableB.3
131	(Mapping for case-folding used with no normalization).
132	</dl>
133
134	<P>
135	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
136	<td><nobr><b><tt id='l2h-1043' xml:id='l2h-1043' class="function">in_table_c11</tt></b>(</nobr></td>
137	<td><var>code</var>)</td></tr></table></dt>
138	<dd>
139	Determine whether <var>code</var> is in tableC.1.1
140	(ASCII space characters).
141	</dl>
142
143	<P>
144	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
145	<td><nobr><b><tt id='l2h-1044' xml:id='l2h-1044' class="function">in_table_c12</tt></b>(</nobr></td>
146	<td><var>code</var>)</td></tr></table></dt>
147	<dd>
148	Determine whether <var>code</var> is in tableC.1.2
149	(Non-ASCII space characters).
150	</dl>
151
152	<P>
153	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
154	<td><nobr><b><tt id='l2h-1045' xml:id='l2h-1045' class="function">in_table_c11_c12</tt></b>(</nobr></td>
155	<td><var>code</var>)</td></tr></table></dt>
156	<dd>
157	Determine whether <var>code</var> is in tableC.1
158	(Space characters, union of C.1.1 and C.1.2).
159	</dl>
160
161	<P>
162	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
163	<td><nobr><b><tt id='l2h-1046' xml:id='l2h-1046' class="function">in_table_c21</tt></b>(</nobr></td>
164	<td><var>code</var>)</td></tr></table></dt>
165	<dd>
166	Determine whether <var>code</var> is in tableC.2.1
167	(ASCII control characters).
168	</dl>
169
170	<P>
171	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
172	<td><nobr><b><tt id='l2h-1047' xml:id='l2h-1047' class="function">in_table_c22</tt></b>(</nobr></td>
173	<td><var>code</var>)</td></tr></table></dt>
174	<dd>
175	Determine whether <var>code</var> is in tableC.2.2
176	(Non-ASCII control characters).
177	</dl>
178
179	<P>
180	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
181	<td><nobr><b><tt id='l2h-1048' xml:id='l2h-1048' class="function">in_table_c21_c22</tt></b>(</nobr></td>
182	<td><var>code</var>)</td></tr></table></dt>
183	<dd>
184	Determine whether <var>code</var> is in tableC.2
185	(Control characters, union of C.2.1 and C.2.2).
186	</dl>
187
188	<P>
189	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
190	<td><nobr><b><tt id='l2h-1049' xml:id='l2h-1049' class="function">in_table_c3</tt></b>(</nobr></td>
191	<td><var>code</var>)</td></tr></table></dt>
192	<dd>
193	Determine whether <var>code</var> is in tableC.3
194	(Private use).
195	</dl>
196
197	<P>
198	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
199	<td><nobr><b><tt id='l2h-1050' xml:id='l2h-1050' class="function">in_table_c4</tt></b>(</nobr></td>
200	<td><var>code</var>)</td></tr></table></dt>
201	<dd>
202	Determine whether <var>code</var> is in tableC.4
203	(Non-character code points).
204	</dl>
205
206	<P>
207	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
208	<td><nobr><b><tt id='l2h-1051' xml:id='l2h-1051' class="function">in_table_c5</tt></b>(</nobr></td>
209	<td><var>code</var>)</td></tr></table></dt>
210	<dd>
211	Determine whether <var>code</var> is in tableC.5
212	(Surrogate codes).
213	</dl>
214
215	<P>
216	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
217	<td><nobr><b><tt id='l2h-1052' xml:id='l2h-1052' class="function">in_table_c6</tt></b>(</nobr></td>
218	<td><var>code</var>)</td></tr></table></dt>
219	<dd>
220	Determine whether <var>code</var> is in tableC.6
221	(Inappropriate for plain text).
222	</dl>
223
224	<P>
225	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
226	<td><nobr><b><tt id='l2h-1053' xml:id='l2h-1053' class="function">in_table_c7</tt></b>(</nobr></td>
227	<td><var>code</var>)</td></tr></table></dt>
228	<dd>
229	Determine whether <var>code</var> is in tableC.7
230	(Inappropriate for canonical representation).
231	</dl>
232
233	<P>
234	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
235	<td><nobr><b><tt id='l2h-1054' xml:id='l2h-1054' class="function">in_table_c8</tt></b>(</nobr></td>
236	<td><var>code</var>)</td></tr></table></dt>
237	<dd>
238	Determine whether <var>code</var> is in tableC.8
239	(Change display properties or are deprecated).
240	</dl>
241
242	<P>
243	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
244	<td><nobr><b><tt id='l2h-1055' xml:id='l2h-1055' class="function">in_table_c9</tt></b>(</nobr></td>
245	<td><var>code</var>)</td></tr></table></dt>
246	<dd>
247	Determine whether <var>code</var> is in tableC.9
248	(Tagging characters).
249	</dl>
250
251	<P>
252	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
253	<td><nobr><b><tt id='l2h-1056' xml:id='l2h-1056' class="function">in_table_d1</tt></b>(</nobr></td>
254	<td><var>code</var>)</td></tr></table></dt>
255	<dd>
256	Determine whether <var>code</var> is in tableD.1
257	(Characters with bidirectional property ``R'' or ``AL'').
258	</dl>
259
260	<P>
261	<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
262	<td><nobr><b><tt id='l2h-1057' xml:id='l2h-1057' class="function">in_table_d2</tt></b>(</nobr></td>
263	<td><var>code</var>)</td></tr></table></dt>
264	<dd>
265	Determine whether <var>code</var> is in tableD.2
266	(Characters with bidirectional property ``L'').
267	</dl>
268
269	<P>
270
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