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title = My Module  # will be converted to mymodule.title = My Module

Starting in OpenMRS 1.9.3 you are allowed to override this behavior, and let your module define message keys outside of its namespace. To do this, you need to include an a special entry in the properties file like:

openmrs.property.ALLOW_KEYS_OUTSIDE_OF_MODULE_NAMESPACE = true

mymodule.title = My Module's Title  # explicitly inside mymodule namespace
othermodule.othercode = Some Other Value  # defines a code in another module's namespace

Example

The main english file should be named messages.properties.  Each other language will be messages_fr.properties (for french)

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