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Contexts correspond to UIMA Pipelines.  A context is associated with an Annotator (Primitive or Aggregate), or (for an aggregate, also its flow controller).

• There is a "root" context.  Aggregates have children and a structure corresponding to the directed acyclical graph of the subparts.

A pipeline's root points to its ResourceManager, which has all the external resources, the CAS Pool, and the extension class loader.  

• A single ResourceManager instance might be shared with multiple pipelines.
• There is a variant / wrapper for context for PEARs, which substitutes a class path associated with the Pear

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Here's a draft of a new chapter for the UIMA Reference, describing resources (it's incubating as part of the v3 users guide)

There is a variant / subclass for Flow Controller components

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