possibility for String Attribut in accesscontrol code

[GoogleCodeExporter]

We want to query access rights with a form.
For this, the groups are written as a string parameter into a template: 
<accesscontrol>{{{Group}}}</accesscontrol>

The problem is that when you save the template, an error is reported.
I suspect, Improved Access Control does not support Stings and noted that a 
group can not have special characters like "{".

Do you know an answer for my problem?

Thank you!

Original issue reported on code.google.com by Mediawik...@googlemail.com on 8 Dec 2011 at 4:50