So the behavior would be roughly like this

hashmap

hibernate.ogm.datastore.provider = map

Infinispan

Either:

• No property, just the presence of the provider in the classpath discovered by reflection and that no other is.
• make hibernate.ogm.infinispan.configuration_resource_name mandatory (it's defaulted today) unless hibernate.ogm.infinispan.cachemanager_jndi_name

EhCache

Either:

• No property, just the presence of the provider in the classpath discovered by reflection and that no other is.
• make hibernate.ogm.ehcache.configuration_resource_name mandatory (it's defaulted today)

MongoDB

Rely on the presence of hibernate.ogm.datastore.database and the fact that the mongodb provider is in the classpath and no other is

Neo4J

Rely on the presence of hibernate.ogm.neo4j.database_path

MongoDB

Rely on the presence of hibernate.ogm.datastore.database and the fact that the couchdb provider is in the classpath and no other is

Other

How to discover non sanctioned datastore providers? We don't have a serviceloader concept today.
I guess mandate hibernate.ogm.datastore.provider

Multiple datastore providers in the classpath

Detect them and force the use of hibernate.ogm.neo4j.database_path