# ## Module c14n from libxml2

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the c14n modules provides a "Canonical XML" implementation ## Table of Contents
    int	xmlC14NDocDumpMemory		(xmlDocPtr doc,
    					 xmlNodeSetPtr nodes,
    					 int exclusive,
    					 xmlChar ** inclusive_ns_prefixes,
    					 int with_comments,
    					 xmlChar ** doc_txt_ptr)
    int	xmlC14NDocSave			(xmlDocPtr doc,
    					 xmlNodeSetPtr nodes,
    					 int exclusive,
    					 xmlChar ** inclusive_ns_prefixes,
    					 int with_comments,
    					 const char * filename,
    					 int compression)
    int	xmlC14NDocSaveTo		(xmlDocPtr doc,
    					 xmlNodeSetPtr nodes,
    					 int exclusive,
    					 xmlChar ** inclusive_ns_prefixes,
    					 int with_comments,
    					 xmlOutputBufferPtr buf)
    int	xmlC14NExecute			(xmlDocPtr doc,
    					 xmlC14NIsVisibleCallback is_visible_callback,
    					 void * user_data,
    					 int exclusive,
    					 xmlChar ** inclusive_ns_prefixes,
    					 int with_comments,
    					 xmlOutputBufferPtr buf)
    Function type: xmlC14NIsVisibleCallback
    int	xmlC14NIsVisibleCallback	(void * user_data,
    					 xmlNodePtr node,
    					 xmlNodePtr parent)
## Description ### Function: xmlC14NDocDumpMemory
    int	xmlC14NDocDumpMemory		(xmlDocPtr doc,
    					 xmlNodeSetPtr nodes,
    					 int exclusive,
    					 xmlChar ** inclusive_ns_prefixes,
    					 int with_comments,
    					 xmlChar ** doc_txt_ptr)
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)
`doc`: | the XML document for canonization
`nodes`: | the nodes set to be included in the canonized image or NULL if all document nodes should be included
`exclusive`: | the exclusive flag (0 - non-exclusive canonicalization; otherwise - exclusive canonicalization)
`inclusive_ns_prefixes`: | the list of inclusive namespace prefixes ended with a NULL or NULL if there is no inclusive namespaces (only for exclusive canonicalization, ignored otherwise)
`with_comments`: | include comments in the result (!=0) or not (==0)
`doc_txt_ptr`: | the memory pointer for allocated canonical XML text; the caller of this functions is responsible for calling xmlFree() to free allocated memory
`Returns`: | the number of bytes written on success or a negative value on fail
### Function: xmlC14NDocSave
    int	xmlC14NDocSave			(xmlDocPtr doc,
    					 xmlNodeSetPtr nodes,
    					 int exclusive,
    					 xmlChar ** inclusive_ns_prefixes,
    					 int with_comments,
    					 const char * filename,
    					 int compression)
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)
`doc`: | the XML document for canonization
`nodes`: | the nodes set to be included in the canonized image or NULL if all document nodes should be included
`exclusive`: | the exclusive flag (0 - non-exclusive canonicalization; otherwise - exclusive canonicalization)
`inclusive_ns_prefixes`: | the list of inclusive namespace prefixes ended with a NULL or NULL if there is no inclusive namespaces (only for exclusive canonicalization, ignored otherwise)
`with_comments`: | include comments in the result (!=0) or not (==0)
`filename`: | the filename to store canonical XML image
`compression`: | the compression level (zlib requred): -1 - libxml default, 0 - uncompressed, >0 - compression level
`Returns`: | the number of bytes written success or a negative value on fail
### Function: xmlC14NDocSaveTo
    int	xmlC14NDocSaveTo		(xmlDocPtr doc,
    					 xmlNodeSetPtr nodes,
    					 int exclusive,
    					 xmlChar ** inclusive_ns_prefixes,
    					 int with_comments,
    					 xmlOutputBufferPtr buf)
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)
`doc`: | the XML document for canonization
`nodes`: | the nodes set to be included in the canonized image or NULL if all document nodes should be included
`exclusive`: | the exclusive flag (0 - non-exclusive canonicalization; otherwise - exclusive canonicalization)
`inclusive_ns_prefixes`: | the list of inclusive namespace prefixes ended with a NULL or NULL if there is no inclusive namespaces (only for exclusive canonicalization, ignored otherwise)
`with_comments`: | include comments in the result (!=0) or not (==0)
`buf`: | the output buffer to store canonical XML; this buffer MUST have encoder==NULL because C14N requires UTF-8 output
`Returns`: | non-negative value on success or a negative value on fail
### Function: xmlC14NExecute
    int	xmlC14NExecute			(xmlDocPtr doc,
    					 xmlC14NIsVisibleCallback is_visible_callback,
    					 void * user_data,
    					 int exclusive,
    					 xmlChar ** inclusive_ns_prefixes,
    					 int with_comments,
    					 xmlOutputBufferPtr buf)
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)
`doc`: | the XML document for canonization
`is_visible_callback`: | the function to use to determine is node visible or not
`user_data`: | the first parameter for @is_visible_callback function (in most cases, it is nodes set)
`exclusive`: | the exclusive flag (0 - non-exclusive canonicalization; otherwise - exclusive canonicalization)
`inclusive_ns_prefixes`: | the list of inclusive namespace prefixes ended with a NULL or NULL if there is no inclusive namespaces (only for exclusive canonicalization, ignored otherwise)
`with_comments`: | include comments in the result (!=0) or not (==0)
`buf`: | the output buffer to store canonical XML; this buffer MUST have encoder==NULL because C14N requires UTF-8 output
`Returns`: | non-negative value on success or a negative value on fail
### Function type: xmlC14NIsVisibleCallback
    Function type: xmlC14NIsVisibleCallback
    int	xmlC14NIsVisibleCallback	(void * user_data,
    					 xmlNodePtr node,
    					 xmlNodePtr parent)
Signature for a C14N callback on visible nodes
`user_data`: | user data
`node`: | the curent node
`parent`: | the parent node
`Returns`: | 1 if the node should be included
Daniel Veillard