When using a valid template with non alphanumeric names for the properties, omniparser refuses the template because of patternProperties declaration such as this one: https://github.com/jf-tech/omniparser/blob/master/extensions/omniv21/validation/transformDeclarations.json#L87, in combination with the additionalProperties: false

Example of a template (notice the $ in the property name):

{ "parser_settings": { "version": "omni.2.1", "file_format_type": "json" }, "transform_declarations": { "FINAL_OUTPUT": { "object": { "$test": { "xpath": "/foo/bar" } } } } }

Which returns this error:

transform_declarations.FINAL_OUTPUT.object: Additional property $test is not allowed transform_declarations.FINAL_OUTPUT.object: Additional property $test is not allowed transform_declarations.FINAL_OUTPUT: Must validate one and only one schema (oneOf) transform_declarations.FINAL_OUTPUT: Must validate one and only one schema (oneOf) 

Happy to provide additional information if needed.

Thanks