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POReading XML data using boost::property_tree library functions in C++
 

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    <pre><code>&lt;?xml version="1.0"?&gt; &lt;sked&gt; &lt;version&gt;2&lt;/version&gt; &lt;flight xmlns:xsi="some_uri" xsi:type="emirates"&gt; &lt;carrier&gt;BA&lt;/carrier&gt; &lt;number&gt;4001&lt;/number&gt; &lt;date&gt;2011-07-21&lt;/date&gt; &lt;/flight&gt; &lt;flight xmlns:xsi="some_uri" xsi:type="cathey-pacific"&gt; &lt;flight_class&gt; &lt;type&gt;Economy&lt;/type&gt; &lt;fare&gt;400&lt;/fare&gt; &lt;/flight_class&gt; &lt;date&gt;2011-07-21&lt;/date&gt; &lt;/flight&gt; &lt;/sked&gt; </code></pre> <p>I have a XML document which describe 2 types of flights by same keywords. Sub fields are depend on the type of the flight. I have to read the XML and store it into C++ data classes according to the type of flights. </p> <p>This is my code segment that is used for this purpose.</p> <pre><code>typedef boost::property_tree::ptree Node; Node pt; read_xml(test.xml, pt); Node skedNode = pt.get_child("sked"); Node flightNode = skedNode.get_child("flight"); BOOST_FOREACH(Node::value_type const&amp; v, skedNode.get_child("sked")) { if (v.first == "flight") { if (v.second.get("&lt;xmlattr&gt;.xsi:type", "Null") == "cathey-pacific") { BOOST_FOREACH(Node::value_type const&amp; v1, flightNode.get_child("flight")) { if(v1.first == "flight_class") FlightClass fclass = FlightClass(static_cast&lt;Node&gt;(flightNode)); } } } } </code></pre> <p>When I try to run the above code, I got nothing inside <code>FlightClass</code>. I tried to debug the above code and found, <code>v1.first</code> is getting the values "carrier", "number" and "value" only. I surprised because, those are the parameter of emirates type of flights. I couldn't receive cathey-pacific flight information. Please help me to find out what the issue is. I really want to get the information of cathy-pacific flights from this XML file and store into C++ data classes. What should I do to correct this?</p> <p>Note: Instead of second <code>BOOST_FOREACH</code>, I tried <code>v.second.get_child("flight");</code> but it's throwing an exception. Then I replaced above by <code>v.second.get_child("flight_class");</code> and it's giving it's sub-fields like: type and fare. What may be the reason for that? It seems it's returning its grandchild nodes.</p>
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