晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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    <h2>
      <span class="refentrytitle">c14n</span>
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    <p>c14n - Provide Canonical XML and Exclusive XML Canonicalization</p>
    <p>the c14n modules provides a  "Canonical XML" implementation</p>
    <p>Author(s): Aleksey Sanin &lt;aleksey@aleksey.com&gt; </p>
    <div class="refsynopsisdiv">
      <h2>Synopsis</h2>
      <pre class="synopsis">typedef enum <a href="#xmlC14NMode">xmlC14NMode</a>;
int	<a href="#xmlC14NExecute">xmlC14NExecute</a>			(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br/>					 <a href="libxml2-c14n.html#xmlC14NIsVisibleCallback">xmlC14NIsVisibleCallback</a> is_visible_callback, <br/>					 void * user_data, <br/>					 int mode, <br/>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br/>					 int with_comments, <br/>					 <a href="libxml2-tree.html#xmlOutputBufferPtr">xmlOutputBufferPtr</a> buf);
int	<a href="#xmlC14NDocSaveTo">xmlC14NDocSaveTo</a>		(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br/>					 <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br/>					 int mode, <br/>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br/>					 int with_comments, <br/>					 <a href="libxml2-tree.html#xmlOutputBufferPtr">xmlOutputBufferPtr</a> buf);
typedef int <a href="#xmlC14NIsVisibleCallback">xmlC14NIsVisibleCallback</a>	(void * user_data, <br/>					 <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node, <br/>					 <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> parent);
int	<a href="#xmlC14NDocSave">xmlC14NDocSave</a>			(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br/>					 <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br/>					 int mode, <br/>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br/>					 int with_comments, <br/>					 const char * filename, <br/>					 int compression);
int	<a href="#xmlC14NDocDumpMemory">xmlC14NDocDumpMemory</a>		(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br/>					 <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br/>					 int mode, <br/>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br/>					 int with_comments, <br/>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** doc_txt_ptr);
</pre>
    </div>
    <div class="refsect1" lang="en">
      <h2>Description</h2>
    </div>
    <div class="refsect1" lang="en">
      <h2>Details</h2>
      <div class="refsect2" lang="en">
        <div class="refsect2" lang="en"><h3><a name="xmlC14NMode">Enum </a>xmlC14NMode</h3><pre class="programlisting">enum <a href="#xmlC14NMode">xmlC14NMode</a> {
    <a name="XML_C14N_1_0">XML_C14N_1_0</a> = 0 /* Origianal C14N 1.0 spec */
    <a name="XML_C14N_EXCLUSIVE_1_0">XML_C14N_EXCLUSIVE_1_0</a> = 1 /* Exclusive C14N 1.0 spec */
    <a name="XML_C14N_1_1">XML_C14N_1_1</a> = 2 /*  C14N 1.1 spec */
};
</pre><p/>
</div>
        <hr/>
        <div class="refsect2" lang="en"><h3><a name="xmlC14NIsVisibleCallback"/>Function type xmlC14NIsVisibleCallback</h3><pre class="programlisting">int	xmlC14NIsVisibleCallback	(void * user_data, <br/>					 <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node, <br/>					 <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> parent)<br/>
</pre><p>Signature for a C14N callback on visible nodes</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>user_data</tt></i>:</span></td><td>user data</td></tr><tr><td><span class="term"><i><tt>node</tt></i>:</span></td><td>the curent node</td></tr><tr><td><span class="term"><i><tt>parent</tt></i>:</span></td><td>the parent node</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>1 if the node should be included</td></tr></tbody></table></div></div>
        <hr/>
        <div class="refsect2" lang="en"><h3><a name="xmlC14NDocDumpMemory"/>xmlC14NDocDumpMemory ()</h3><pre class="programlisting">int	xmlC14NDocDumpMemory		(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br/>					 <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br/>					 int mode, <br/>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br/>					 int with_comments, <br/>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** doc_txt_ptr)<br/>
</pre><p>Dumps the canonized image of given XML document into memory. For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>doc</tt></i>:</span></td><td>the XML document for canonization</td></tr><tr><td><span class="term"><i><tt>nodes</tt></i>:</span></td><td>the nodes set to be included in the canonized image or NULL if all document nodes should be included</td></tr><tr><td><span class="term"><i><tt>mode</tt></i>:</span></td><td>the c14n mode (see @xmlC14NMode)</td></tr><tr><td><span class="term"><i><tt>inclusive_ns_prefixes</tt></i>:</span></td><td>the list of inclusive namespace prefixes ended with a NULL or NULL if there is no inclusive namespaces (only for exclusive canonicalization, ignored otherwise)</td></tr><tr><td><span class="term"><i><tt>with_comments</tt></i>:</span></td><td>include comments in the result (!=0) or not (==0)</td></tr><tr><td><span class="term"><i><tt>doc_txt_ptr</tt></i>:</span></td><td>the memory pointer for allocated canonical XML text; the caller of this functions is responsible for calling xmlFree() to free allocated memory</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>the number of bytes written on success or a negative value on fail</td></tr></tbody></table></div></div>
        <hr/>
        <div class="refsect2" lang="en"><h3><a name="xmlC14NDocSave"/>xmlC14NDocSave ()</h3><pre class="programlisting">int	xmlC14NDocSave			(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br/>					 <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br/>					 int mode, <br/>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br/>					 int with_comments, <br/>					 const char * filename, <br/>					 int compression)<br/>
</pre><p>Dumps the canonized image of given XML document into the file. For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>doc</tt></i>:</span></td><td>the XML document for canonization</td></tr><tr><td><span class="term"><i><tt>nodes</tt></i>:</span></td><td>the nodes set to be included in the canonized image or NULL if all document nodes should be included</td></tr><tr><td><span class="term"><i><tt>mode</tt></i>:</span></td><td>the c14n mode (see @xmlC14NMode)</td></tr><tr><td><span class="term"><i><tt>inclusive_ns_prefixes</tt></i>:</span></td><td>the list of inclusive namespace prefixes ended with a NULL or NULL if there is no inclusive namespaces (only for exclusive canonicalization, ignored otherwise)</td></tr><tr><td><span class="term"><i><tt>with_comments</tt></i>:</span></td><td>include comments in the result (!=0) or not (==0)</td></tr><tr><td><span class="term"><i><tt>filename</tt></i>:</span></td><td>the filename to store canonical XML image</td></tr><tr><td><span class="term"><i><tt>compression</tt></i>:</span></td><td>the compression level (zlib requred): -1 - libxml default, 0 - uncompressed, &gt;0 - compression level</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>the number of bytes written success or a negative value on fail</td></tr></tbody></table></div></div>
        <hr/>
        <div class="refsect2" lang="en"><h3><a name="xmlC14NDocSaveTo"/>xmlC14NDocSaveTo ()</h3><pre class="programlisting">int	xmlC14NDocSaveTo		(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br/>					 <a href="libxml2-xpath.html#xmlNodeSetPtr">xmlNodeSetPtr</a> nodes, <br/>					 int mode, <br/>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br/>					 int with_comments, <br/>					 <a href="libxml2-tree.html#xmlOutputBufferPtr">xmlOutputBufferPtr</a> buf)<br/>
</pre><p>Dumps the canonized image of given XML document into the provided buffer. For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>doc</tt></i>:</span></td><td>the XML document for canonization</td></tr><tr><td><span class="term"><i><tt>nodes</tt></i>:</span></td><td>the nodes set to be included in the canonized image or NULL if all document nodes should be included</td></tr><tr><td><span class="term"><i><tt>mode</tt></i>:</span></td><td>the c14n mode (see @xmlC14NMode)</td></tr><tr><td><span class="term"><i><tt>inclusive_ns_prefixes</tt></i>:</span></td><td>the list of inclusive namespace prefixes ended with a NULL or NULL if there is no inclusive namespaces (only for exclusive canonicalization, ignored otherwise)</td></tr><tr><td><span class="term"><i><tt>with_comments</tt></i>:</span></td><td>include comments in the result (!=0) or not (==0)</td></tr><tr><td><span class="term"><i><tt>buf</tt></i>:</span></td><td>the output buffer to store canonical XML; this buffer MUST have encoder==NULL because C14N requires UTF-8 output</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>non-negative value on success or a negative value on fail</td></tr></tbody></table></div></div>
        <hr/>
        <div class="refsect2" lang="en"><h3><a name="xmlC14NExecute"/>xmlC14NExecute ()</h3><pre class="programlisting">int	xmlC14NExecute			(<a href="libxml2-tree.html#xmlDocPtr">xmlDocPtr</a> doc, <br/>					 <a href="libxml2-c14n.html#xmlC14NIsVisibleCallback">xmlC14NIsVisibleCallback</a> is_visible_callback, <br/>					 void * user_data, <br/>					 int mode, <br/>					 <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** inclusive_ns_prefixes, <br/>					 int with_comments, <br/>					 <a href="libxml2-tree.html#xmlOutputBufferPtr">xmlOutputBufferPtr</a> buf)<br/>
</pre><p>Dumps the canonized image of given XML document into the provided buffer. For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)</p>
<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>doc</tt></i>:</span></td><td>the XML document for canonization</td></tr><tr><td><span class="term"><i><tt>is_visible_callback</tt></i>:</span></td><td>the function to use to determine is node visible or not</td></tr><tr><td><span class="term"><i><tt>user_data</tt></i>:</span></td><td>the first parameter for @is_visible_callback function (in most cases, it is nodes set)</td></tr><tr><td><span class="term"><i><tt>mode</tt></i>:</span></td><td>the c14n mode (see @xmlC14NMode)</td></tr><tr><td><span class="term"><i><tt>inclusive_ns_prefixes</tt></i>:</span></td><td>the list of inclusive namespace prefixes ended with a NULL or NULL if there is no inclusive namespaces (only for exclusive canonicalization, ignored otherwise)</td></tr><tr><td><span class="term"><i><tt>with_comments</tt></i>:</span></td><td>include comments in the result (!=0) or not (==0)</td></tr><tr><td><span class="term"><i><tt>buf</tt></i>:</span></td><td>the output buffer to store canonical XML; this buffer MUST have encoder==NULL because C14N requires UTF-8 output</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>non-negative value on success or a negative value on fail</td></tr></tbody></table></div></div>
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