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In the repository folder on your server, locate the Templates folder and find the XML that relates to the Template you are editing.If the collection has already been created, you will find the schema in repository/MyInstitution~1~1/Schema
The collection schema file is located in the following directory where "LUNA" is the installation directory and "LUNA~1~1" should be replaced by the collection's ID for which they are making the changes.
~\LUNA\repository\LUNA~1~1\Schema\
Any backend changes to the schema file should be followed by restarting Tomcat.