public interface PropertySourceProvider
Implement this interfaces to provide a PropertySource provider which is able to register multiple PropertySources. This is e.g. needed if there are multiple property files of a given config file name.
If a PropertySource like JNDI only exists once, then there is no need
to implement it via the PropertySourceProvider but should directly
A PropertySourceProvider will get picked up via the
ServiceLoader mechanism and must get registered via
static final PropertySourceProvider EMPTY
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