Hi Raghuveer,
The purpose of xsaccess file is that it enables you to specify who or what is authorized to access the content exposed by a SAP HANA XS application package and what content they are allowed to see.
If you want anonymous connections without any credentials, you have to also use .xssqlcc file
Check HANA Developer Guide, Section 3.5.3 for more info:
http://help.sap.com/hana/SAP_HANA_Developer_Guide_en.pdf
Regards,
Vivek