if you hv any example code please share for my ref bz i dnt understand how i start this?
and also please help for SDHC card interface with 8051,bz i am new in this concept.
I'm not working on XML/SOAP software projects. There's plenty of open source software on the internet. https://en.wikipedia.org/wiki/SOAP
As said, you should primarly get an idea about the processor resources required for it and clarify if your system is suited, respectively how it can be extended.
SDHC is just an extension of the SD card standard, requiring a few supplements to the card interface software and FAT implementation. You'll find 8051 SD card projects on the internet.