Do we have XLST smart service available in Appian either OOTB or custom smart se

Providing use cases generally helps the wider community to provide better suggestions. The more detailed and clear the use cases are, the more the community can help. Thanks for sharing your use case here.

For calling a web service based on an XML input, what exactly is the challenge you are facing? I might not be understanding your use case completely, but I would think that this is a case of using logic nodes to determine which service to invoke based on the data you receive.

Regarding dynamic email HTML templates - you could probably use a bit of JS inside your HTML and control how the html is rendered. What design are you currently using and what are the challenges you are facing?

And regarding the third use case - there is a smart service to read files from filesystem (Shared Components - Smart Services - Appian Collab/File system utilities).

Providing use cases generally helps the wider community to provide better suggestions. The more detailed and clear the use cases are, the more the community can help. Thanks for sharing your use case here.

For calling a web service based on an XML input, what exactly is the challenge you are facing? I might not be understanding your use case completely, but I would think that this is a case of using logic nodes to determine which service to invoke based on the data you receive.

Regarding dynamic email HTML templates - you could probably use a bit of JS inside your HTML and control how the html is rendered. What design are you currently using and what are the challenges you are facing?

And regarding the third use case - there is a smart service to read files from filesystem (Shared Components - Smart Services - Appian Collab/File system utilities).