AbstractsComputer Science

In recent years the research on XML security over relational newlinedatabases has become popular due to the fact that XML became the de facto newlinestandard for data representation and exchange on the internet Moreover newlinemany XML documents are stored in a Relational Data Base Management newlineSystem RDBMS so that it can be retrieved faster In order to secure the newlineXML data XML documents access control policy definitions have been newlineprovided by the Organization for the Advancement of Structured Information newlineStandards OASIS and the ratified eXtensible Access Control Markup newlineLanguage XACML standard Rissanen 2013 XACML is an XML based newlinelanguage for access control Rissanen 2013 XACML is an access control newlinepolicy language which uses an Attribute Based Access Control ABAC newlinemechanism and provides an access request and response language newlineThis policy language can be used to construct expressions that newlinemake up an access control policy that describes the security mechanisms The newlinerequest and response language defines the format and values of elements that newlinecan be used to compose a query request for access to a resource Although newlineXACML is an integral policy description language the structure of the newlineexisting XACML policy is very complex and hard newline newline%%%reference p153-171.