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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Current File : //usr/include/libxml2/libxml/c14n.h
/*
 * Summary: Provide Canonical XML and Exclusive XML Canonicalization
 * Description: the c14n modules provides a
 *
 * "Canonical XML" implementation
 * http://www.w3.org/TR/xml-c14n
 *
 * and an
 *
 * "Exclusive XML Canonicalization" implementation
 * http://www.w3.org/TR/xml-exc-c14n

 * Copy: See Copyright for the status of this software.
 *
 * Author: Aleksey Sanin <aleksey@aleksey.com>
 */
#ifndef __XML_C14N_H__
#define __XML_C14N_H__
#ifdef LIBXML_C14N_ENABLED
#ifdef LIBXML_OUTPUT_ENABLED

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#include <libxml/xmlversion.h>
#include <libxml/tree.h>
#include <libxml/xpath.h>

/*
 * XML Canonicazation
 * http://www.w3.org/TR/xml-c14n
 *
 * Exclusive XML Canonicazation
 * http://www.w3.org/TR/xml-exc-c14n
 *
 * Canonical form of an XML document could be created if and only if
 *  a) default attributes (if any) are added to all nodes
 *  b) all character and parsed entity references are resolved
 * In order to achive this in libxml2 the document MUST be loaded with
 * following global setings:
 *
 *    xmlLoadExtDtdDefaultValue = XML_DETECT_IDS | XML_COMPLETE_ATTRS;
 *    xmlSubstituteEntitiesDefault(1);
 *
 * or corresponding parser context setting:
 *    xmlParserCtxtPtr ctxt;
 *
 *    ...
 *    ctxt->loadsubset = XML_DETECT_IDS | XML_COMPLETE_ATTRS;
 *    ctxt->replaceEntities = 1;
 *    ...
 */

/*
 * xmlC14NMode:
 *
 * Predefined values for C14N modes
 *
 */
typedef enum {
    XML_C14N_1_0            = 0,    /* Origianal C14N 1.0 spec */
    XML_C14N_EXCLUSIVE_1_0  = 1,    /* Exclusive C14N 1.0 spec */
    XML_C14N_1_1            = 2     /* C14N 1.1 spec */
} xmlC14NMode;

XMLPUBFUN int XMLCALL
		xmlC14NDocSaveTo	(xmlDocPtr doc,
					 xmlNodeSetPtr nodes,
					 int mode, /* a xmlC14NMode */
					 xmlChar **inclusive_ns_prefixes,
					 int with_comments,
					 xmlOutputBufferPtr buf);

XMLPUBFUN int XMLCALL
		xmlC14NDocDumpMemory	(xmlDocPtr doc,
					 xmlNodeSetPtr nodes,
					 int mode, /* a xmlC14NMode */
					 xmlChar **inclusive_ns_prefixes,
					 int with_comments,
					 xmlChar **doc_txt_ptr);

XMLPUBFUN int XMLCALL
		xmlC14NDocSave		(xmlDocPtr doc,
					 xmlNodeSetPtr nodes,
					 int mode, /* a xmlC14NMode */
					 xmlChar **inclusive_ns_prefixes,
					 int with_comments,
					 const char* filename,
					 int compression);


/**
 * This is the core C14N function
 */
/**
 * xmlC14NIsVisibleCallback:
 * @user_data: user data
 * @node: the curent node
 * @parent: the parent node
 *
 * Signature for a C14N callback on visible nodes
 *
 * Returns 1 if the node should be included
 */
typedef int (*xmlC14NIsVisibleCallback)	(void* user_data,
					 xmlNodePtr node,
					 xmlNodePtr parent);

XMLPUBFUN int XMLCALL
		xmlC14NExecute		(xmlDocPtr doc,
					 xmlC14NIsVisibleCallback is_visible_callback,
					 void* user_data,
					 int mode, /* a xmlC14NMode */
					 xmlChar **inclusive_ns_prefixes,
					 int with_comments,
					 xmlOutputBufferPtr buf);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* LIBXML_OUTPUT_ENABLED */
#endif /* LIBXML_C14N_ENABLED */
#endif /* __XML_C14N_H__ */

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