RECEIVING CUSTOMER DATA XMLXcbl AND POSTING TO SAP

Hai friends,
Good Morning, can anyone gelp me in mapping the Customer data DTD to Xcbl standards. i receive an XML file of Xcbl Standards to Business connector using HTTP.I should map in BC Developer such that it should convert into an IDOC format and post it to SAP.
We have downloded some DTD’s from Xcbl.org but we couldn’t find which DTD gives information regarding Customer data.
Please help me as we are new to this concept.
Thanks in advance,
Shankar