In XMLTemplater, is it possible to process attributes of an XML element through a distinct sub-template (i.e. through {fme:process-template(" ")} ) ?

I convert input features to XML using XMLTemplater. Everything is fine as long it is done through the same sub-template. When I try to process some attributes (coordinates reading) by calling another sub-template it fails.

This sub-template works properly 

**OBJECT Sub-Template**

{<object

  id="{fme:get-attribute("id")}"

  visible="{fme:get-attribute("visible")}"

  lon="{geom:get-y-coord()}" 

  lat="{geom:get-x-coord()}" >

</object>}

This one, calling another sub-template, doesn't work.

**OBJECT Sub-Template**

{<object

  id="{fme:get-attribute("id")}"

  visible="{fme:get-attribute("visible")}"

  {fme:process-template("XY")} > Here is the syntax error: unexpected character "{" near line 4, column 5 .

</object>}

**XY Sub-Template**

{ lon="{geom:get-y-coord()}" 

  lat="{geom:get-x-coord()}" }

I did try a lot of things but I still don't see what the problem is 😞

Thanks for any help...