Context: Within your application domain, you not only have to deal with individual domain objects, but also composite entities (e.g., a book of notebook pages, a website of web pages), and collections of entities (e.g.,the result of query). page 
Collection WrapperContext: Within your application domain, you not only have to deal with individual domain objects, but also composite entities (e.g., a book of notebook pages, a website of web pages), and collections of entities (e.g.,the result of query). page