xacml访问控制源码，符合OASIS XACML2.0标准，可以升级到XACML3.0，扩展性好，可作为访问控制研究的学习资料。-xacml access control, source code, in line with OASIS XACML2.0 standard, you can upgrade to XACML3.0, good scalability can be used as access control study