The native format of an OpsMgr 2007 management pack is an XML document.  This document must conform to the management pack schema. 

This section documents all the elements and attributes of the schema.  For conceptual information on each type of object in the management pack you should refer to the concepts section of this site.

All the images of the schema in this section were taken from Altova XML Spy.  This piece of software is one of the best XML editors out there!