XML file to OVF format

I have a xml file which contains details about  processor,memory,logical partition and OS to be installed on Logical  partitions.I want to convert this XML file into an OVF format.The biggest challange is OVF discriptor XML file tag  are not exactly matching with my XML file tag.Is it possible to define out own tags such as max memory,min memory ,sharing mode etc in each LPAR memory section??? Is there any Virtual tool available for automatic conversion of XML to OVF?? or do I  need to map it pro-grammatically?

Thanks in advance ..