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Author: Ajith Kumar (Admar Ajith Kumar Somappa)
Homepage: www.hib.no/ansatte/aaks
Title : Tutorial to use xml as input file in MiXiM for superframe  
		structure
References: MiXiM, OMNET++
Weblink: Check Omnet User manual for detailed xml methods and usage
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In this tutorial I would like to show steps to use external xml file as input to a
source code in MiXiM. The obstacles or errors caused due to improper usage.

An example xml file
<?xml version="1.0" encoding="UTF-8"?>
<root>
	<transmitSlots>
		<value>0</value>
		<value>1</value>			
	</transmitSlots>
	<receiveSlots>
		<value>1</value>
		<value>0</value>
	</receiveSlots>
</root>

In the NED file for MAC or any other NED file for source code
//Getting the xml file from ini file 
        xml xmlFile;

In the ini file, since we use it in the MAC source file
**.node[*].nic.mac.xmlFile = xmldoc("xmlFile.xml")

In the header file, important data types required
cXMLElement *xmlFile;
cXMLElement *xmlBuffer;

cXMLElementList nList;
cXMLElementList::iterator xmlListIterator;
short transmitSlots[n]; // To be used within transmitSlots

In the initialize method of the main source file, to take input from the NED file 
xmlFile = par("xmlFile");

xmlBuffer = xmlFile->getFirstChild(); // Gets the transmitSlots  part
nList = xmlBuffer->getChildren();     // Gets all the children  

xmlListIterator = nList.begin(); // Use iterator to read all children values

//Iterating on the nList or all childrens of transmitSlots
for(int i=0;xmlListIterator!=nList.end();xmlListIterator++,i++)
{
   xmlBuffer = (*xmlListIterator);
   transmitSlots[i] = atoi(xmlBuffer->getNodeValue()); // Storing all children values
}

!!Important 
Do not destruct the pointers, will give an exit code (139) of 
attempting to delete unexisting pointers

Also you might need #include <cstdlib> for use of atoi
atoi - a method to convert charcter to integer value