Where do we have the public GIT repos for XACML and XACML Mediation Feature?

If you want to do changes to the XACML and XACML mediation features and use it within your product, you can get the code from the below locations.

 XACML
https://github.com/wso2/carbon-identity-framework/tree/master/features/xacml  

XACML Mediation Feature https://github.com/wso2/carbon-mediation/tree/master/components/mediators/entitlement/org.wso2.carbon.identity.entitlement.mediator