自分用メモ。
a.cpp

# include <stdio.h>

# include <boost/property_tree/ptree.hpp>
# include <boost/property_tree/xml_parser.hpp>

# include <sstream>
# include <string>

const static std::string XML = "\
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\
<soapenv:Envelope xmlns:soapenc=\"http://schemas.xmlsoap.org/soap/encoding/\" xmlns:soapenv=\"http://schemas.xmlsoap.org/soap/envelope/\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\">\
	<soapenv:Body>\
		<RetrievePropertiesResponse xmlns=\"urn:vim25\">\
			<returnval>\
				<obj type=\"Datacenter\">datacenter-2</obj>\
				<propSet>\
					<name>hostFolder</name>\
					<val type=\"Folder\" xsi:type=\"ManagedObjectReference\">group-h4</val>\
				</propSet>\
				<propSet>\
					<name>name</name>\
					<val xsi:type=\"xsd:string\">vDatacenter</val>\
				</propSet>\
			</returnval>\
			<returnval>\
				<obj type=\"Datacenter\">datacenter-968</obj>\
				<propSet>\
					<name>hostFolder</name>\
					<val type=\"Folder\" xsi:type=\"ManagedObjectReference\">group-h970</val>\
				</propSet>\
				<propSet>\
					<name>name</name>\
					<val xsi:type=\"xsd:string\">新規データセンター</val>\
				</propSet>\
			</returnval>\
		</RetrievePropertiesResponse>\
	</soapenv:Body>\
</soapenv:Envelope>\
";

int main( int , char ** ) {
	
	boost::property_tree::ptree pt;
	std::stringstream ss( XML );
	boost::property_tree::read_xml( ss, pt );
	
	for( auto &it : pt.get_child( "soapenv:Envelope.soapenv:Body.RetrievePropertiesResponse" ) ) {
		
		if( it.first != "returnval" ) {
			
			continue;
			
		}
		
		std::string type = it.second.get<std::string>( "obj.<xmlattr>.type" );
		std::string entity = it.second.get<std::string>( "obj" );
		
		printf( "%s\t%s\n", type.c_str(), entity.c_str() );
		
		for( auto &itt: it.second ) {
			
			if( itt.first != "propSet" ) {
				
				continue;
				
			}
			
			std::string name = itt.second.get<std::string>( "name" );
			std::string val = itt.second.get<std::string>( "val" );
			
			printf( "\t%s\t%s\n", name.c_str(), val.c_str() );
			
		}
		
	}
	
	return( 0 );
	
}

/*
[todanano@localhost tmp]$ ./a.out
Datacenter      datacenter-2
        hostFolder      group-h4
        name    vDatacenter
Datacenter      datacenter-968
        hostFolder      group-h970
        name    新規データセンター
[todanano@localhost tmp]$
*/