[xacml-comment] Hi, why XACML does not specify the target data model?

As working draft 14 says, XACML does not specify the data model. My
questions are:

1. Why?

2. Is current design powerful enough to meet different requirements of a
variety of target data models?

Thanks!

Best Regards,

Yang Shunxiang, 杨顺祥
IBM China Research Lab
4F, HaoHai, #7, 5th Street, Shangdi, BEIJING, 100085, CHINA
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