I am trying to use RapidXML to parse xml content that looks like this:
<?xml version="1.0" ?>
<!DOCTYPE open-psa>
<open-psa>
<define-gate name="top" >
<or>
<gate name="g1" />
<gate name="g2" />
</or>
</define-gate>
<define-basic-event name="e1">
<exponential>
<parameter name="lambda1" />
<mission-time />
</exponential>
</define-basic-event>
<define-parameter name="lambda1">
<lognormal-deviate>
<float value="2.0e-5" />
<float value="3" />
<float value="0.95" />
</lognormal-deviate>
</define-parameter>
</open-psa>
I have been able to access all of the direct children to open-psa using the following code
cout << "Importing fault tree...\n" ;
xml_document<> doc;
xml_node<> * root_node;
char* node_name;
// Read the xml file into a buffer
ifstream theFile ("SmallTree.xml");
vector<char> buffer((istreambuf_iterator<char>(theFile)),
istreambuf_iterator<char>());
buffer.push_back('\0');
// Parse the buffer
doc.parse<0>(&buffer[0]);
// Find the root node
root_node = doc.first_node("open-psa");
// Iterate over all child nodes
for (xml_node<> * node = root_node->first_node(); node; node = node->next_sibling())
{
node_name = node->name();
if (strcmp(node_name, "define-gate" ) == 0)
{
cout << node->name() << ", ";
cout << node->first_attribute("name")->value() << endl;
}
else if (strcmp(node_name, "define-basic-event" ) == 0)
{
cout << node->name() << ", ";
cout << node->first_attribute("name")->value() << endl;
}
else if (strcmp(node_name, "define-parameter" ) == 0)
{
cout << node->name() << ", ";
cout << node->first_attribute("name")->value() << endl;
}
}
Now I am stuck. How do I access the elements nested in, say, define-gate name="top" As you might guess an actual .xml file may have a very large number of gates, basic events, parameters etc., and I do not think I can assume any particular ordering.