Source data validation in OIC

Summary

Source data validation in OIC

Content

Hi All,
I Need to validate data  csv file coming from source in OIC for e.g mandatory fields number etc.I think it using javaScript function call is the good way to do.But here I am facing some issue 

1>How to pass the xml obejct in javaScript fucnction
2>Is it possble to convert the xml to json and to pass the object in JavaSript function
3>Can I create a separate variable in OIC to hold this Json value and pass to java script.

you can also suggest if any better option available.I came across with one option to write in stage file directory and then read it based on the custom  created schema for validation.