Hi Vedika,
Please refer to the below mentioned document, which is the best ever document for descibing the SAP SOA architecture deeply.
http://www.actional.com/resources/webinars/Jumpstarting-SOA/SOA-SAP.html
well SAP SOA is different from others because SAP specific SOA is called eSOA that means there is an Enterprise functionality which is combined to the services exposed by SAP.
In IBM SOA, this is only the technical service oriented communication concept which is used to communicate between distributed computing.
Well if we talk about oracle which is a competitor of SAP is also heavily investing in SOA, oracle has recently introduced its product called Fusion, which is based on SOA technology to give a competition to SAP eSOA.
You can refer this link for more details about oracle SOA strategy.
http://www.oracle.com/technologies/soa/index.html
Now if you want to compare these three IBM, Oracle and SAP then this is the very good article written by Mark Brunelli. This will answer all your queries regarding the comparison between Oracle and SAP SOA factor.
http://searchoracle.techtarget.com/originalContent/0,289142,sid41_gci1259116,00.html
Regards
Sumit Bhutani
Bluesky
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