Research of XML engine security model on Web services

Web services provide interface access to the software.And the interface realizes the calls of services on the Internet.Web services are based on XML.They make use of XML-based protocols to describe operations to be performed and data to exchange with one another regardless of location and operating systems.SOAP is a transfer protocol of Web services whose messages have universally adopted XML as the mechanism for encoding data.XML is located at message layer in the whole Web services application.XML engine deals with XML data in the Web services,therefore it is named the message layer gateway.On the XML Engine platform,with the help of DSO mechanism,it can dynamically load the encryption,decryption,digital signature,validation,and filtrtion modules into the Apache server.XML Engine can filter the XML data to make sure the safety of Web services.Meanwhile,it is not only applied to SOAP package,but also to any situation relating to XML filtration.