Check for existing XML element

Question

Dear all,
I'm trying to write a simple script first checking to see whether an XML element exists, and then creating it if it doesn't. I've tried editing a piece of code that I used previously to do the same for paragraph styles, but apparently it's not that straightforward. Currently, all I get is the error "Cannot execute the script in target engine 'main'!" Without the checking, adding the XML element based on the search result works fine.
/* Find all instances of the word "Superscript" */
app.findTextPreferences.findWhat = "Superscript";
var mySuperscript = myDocument.findText(); // Save search result for future reference
/* See if an XML element named "Superscript" already exists, and create it if that's not the case; then add it to all instances of the word "Superscript" */
var myXMLElementSuper = myDocument.xmlElements.item("Superscript");
try {
var myName = myXMLElementSuper.name;
catch (myError){
    var myXMLElementSuper = myDocument.xmlElements.add({markupTag:"Superscript", xmlContent:mySuperscript[i]});}
Any assistance would be greatly appreciated!
Kind regards and thanks in advance,
Julian

Answer 1

Try this,
app.findTextPreferences=app.changeTextPreferences=null; 
app.findTextPreferences.findWhat = "Superscript"; 
var mySuperscript = app.activeDocument.findText();
for(var i=0; i< mySuperscript.length; i++)
    if(mySuperscript[i].associatedXMLElements[0].markupTag.name != "Superscript")
        app.activeDocument.xmlElements[0].xmlElements.add({markupTag:"Superscript", xmlContent:mySuperscript[i]}); 
app.findTextPreferences=app.changeTextPreferences=null; 
Vandy