Collection {#GlossaryCollection}
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@GE{Collection}: A collection consists of documents. It is uniquely identified
by its collection identifier. It also has a unique name that clients should use
to identify and access it. Collections can be renamed. is will change the
collection name, but not the collection identifier. Collections have a _type_
that is specified by the user when the collection is created. There are
currently two types: _document_ and _edge_.  The default type is _document_.