From the webpage:
The OASIS LegalRuleML TC defines a rule interchange language for the legal domain. The work enables modeling and reasoning that allows implementers to structure, evaluate, and compare legal arguments constructed using the rule representation tools provided.
Legal Informatics posted a notice of a new tutorial introduction to LegalRuleML.
If you are planning IT or semantic integration projects in legal circles, worth your while to take a look at LegalRuleML.