/usr/share/doc/libneedle-ruby1.8/doc/manual/parts/models_overview.txt is in libneedle-ruby1.8 1.3.0-1.
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1 2 3 | Service models are the mechanism by which a client can specify how the lifestyle of a particular service should be managed. By default, all services are managed as _singletons_, but it is a simple matter to choose a different behavior when a service is registered.
Underneath, service models are implemented using an _instantiation pipeline_.
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