The properties object inside the template object (see template) contains all default properties of the template file as well as any custom properties.
properties
template
To view and complement the file properties, select File > Properties on the menu. See File properties.
Following are the default properties.
List
Date
This script stores a default property (author) and a custom property in variables.
var author = merge.template.properties.author; var myProperty = merge.template.customProperties.myPropertyName;