Could any one please suggest how to read an XML file using any smart service?

Try the below expression to convert the XML file to text array. Then you can use 'joinarray' to get the elements as a single text.

xpathdocument(pv!XMLDocument,"/rootElement")

You can refer the link for more details
forum.appian.com/.../

For converting to Base64 to Text, I don't think smart service is available out of the box or as a plugin on forum. You may have to write a custom smart service for it.

Try the below expression to convert the XML file to text array. Then you can use 'joinarray' to get the elements as a single text.

xpathdocument(pv!XMLDocument,"/rootElement")

You can refer the link for more details
forum.appian.com/.../

For converting to Base64 to Text, I don't think smart service is available out of the box or as a plugin on forum. You may have to write a custom smart service for it.