OK, I do see one problem that might be causing issues: if you are going to use Windows-style path separators ("\"), you'll need to use single quotes rather than double quotes around the file path. Using double quotes causes the backslashes to be interpreted as escape characters. So, try changing the command in your menu_add statement to this:
validate_schematron('E:\DITA_Custom\custom\doctypes\condition-relaxed\drugTableValidation.sch', "Schematron 1 Errors");
To figure out what part of the script might be failing you can use response() calls to pop up status at various points in the script. So, you could try something like this:
unction validate_schematron(schfile, log_name, doc=current_doc()) {
response("validate_schematron is running");
local msgs[];
local result = validate_against_schematron(msgs, doc, schfile);
response("validate_against_schematron is done, generated " . count(msgs) . " messages");
schematron::add_errors_to_log(msgs, doc, log_name);
response("validate_schematron is done, exiting script");
}
If everything is working right, you should get popup messages indicating the progress through the script.
Note that if there are no errors in your document (i.e. none of the schematron rules triggers a message), seeing nothing is the expected result. So, when you are testing, make sure your document has some conditions that will generate warnings.
