[xml] DTD navigation within libxml

["james binks" <jcbinks hotmail com>]

Hi there,

I'm using libxml v2.4.9 to load a DTD into memory. I load the DTD using the 
following code:

   xmlDocPtr doc = xmlNewDoc(BAD_CAST "1.0");

   xmlCreateIntSubset(doc, BAD_CAST "host_rm", BAD_CAST "-//XXX//YYY//EN",  
BAD_CAST dtd_file);

   doc->extSubset = xmlParseDTD(doc->intSubset->ExternalID, 
doc->intSubset->SystemID);

I then navigate it by using xmlNodePtr to hold nodes. This enables me to 
extract all the elements and their attributes from the DTD, using the 
children and type properties of xmlNodePtr.

The question I have for the list is how do I find out how many subelements 
an element may contain ?

e.g. in my DTD I have
<!ELEMENT ACCUNIT (COUNTER*, REJECTREASON?, SYSTEM?)>

I'm trying to extract the logic that ACCUNIT may contain zero or more 
COUNTER elements then optional REJECTREASON and SYSTEM elements. Do 
functions/properties exist that could give me this info, where should I be 
looking ?

Apologies if this is a dumb question, I'm pretty new to the world of XML but 
desperately trying to get up to speed in it for a demanding project at work 
! Any assistance much appreciated,

Thanks,

  James Binks




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