Our project aims at building a library for specifying units of measure in POSL and RuleML 1.0, by modeling aspects of Tom Gruber's Ontolingua-based classical work. This will be used to build a knowledge base in Naf Hornlog RuleML for execution in OO jDREW.The second part of the project is about the transformation of units, e.g. Fahrenheit to Celsius and vice versa.