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clarify soem terminology

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git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@8229 57a11ea4-9604-0410-9ed3-97b8803252fd
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Linas Vepstas 2003-04-13 03:09:11 +00:00
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src/doc/engine.txt
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@ -26,4 +26,15 @@ then it is better to implement it as a C struct, and similarly
design an appropriate SQL table around it, so that the database
can be queried efficiently and rapidly.
Terminology:
First-class object: something that has a C struct associated with it,
nad has its own specialized backend infrastructure for storing/quering
it.
Second-class object: something that lives entirely in a KVP tree.
Note, however, that not all data in a KVP tree deserves to be called
an 'object'. Some things in a KVP tree are merely 'attributes'.
If you push on this point, there is indeed a gray area between
second-class objects and attributes.