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RM Prescriptions
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1. Scalar types
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ODMG conforms, partly. However, (a) the distinction between literal and object atomic types seems unnecessary and confusing;12 (b) there does not appear to be a way of destroying userdefined scalar types; (c) ODMG s objects have object IDs; (d) ODMG objects have structure as
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12. In fact, it looks like a serious violation of orthogonality. At best, it requires many specifications regarding valid operations, for example to be duplicated; at worst, it introduces undesirable rules and distinctions. (In fact, it seems to us that the ODMG distinction between literals and objects has something to do with another ODMG distinction that we also find unnecessary and confusing: namely, that between structure and behavior.)
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CHAPTER 27 A COMPARISON BETWEEN ODMG AND THE THIRD MANIFESTO
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well as behavior; (e) instead of supporting Manifesto-style selectors, ODMG requires new object instances (apparently uninitialized) to be created by means of a prescribed NEW operator. Note: OQL (as opposed to the ODMG Object Model as such) does include something it calls a type name constructor that seems to be more akin to our selector, however.
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2. Scalar values are typed
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ODMG conforms, subject to the reservations indicated under RM Prescription 1.
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3. Read-only vs. update operators
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ODMG conforms, partly. However, (a) there does not appear to be a way of destroying userdefined operators; (b) it is not clear whether ODMG conforms to the Manifesto s many prescriptions regarding the distinction between read-only and update operators.
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4. Physical vs. possible representations
ODMG fails (it does not clearly distinguish between physical and possible representations).
5. Expose possible representations
ODMG fails a fortiori. However, it does expose physical representations. It is not clear whether it supports anything analogous to the Manifesto s nestable THE_ pseudovariables.
6. Type generator TUPLE
ODMG conforms, partly. However, (a) the distinction between literal and object tuple types seems unnecessary and confusing; (b) there does not appear to be a way of destroying userdefined tuple types; (c) ODMG s tuple objects have object IDs; (d) instead of supporting tuple selectors, ODMG requires new object instances (apparently uninitialized) to be created by means of a prescribed NEW operator; (e) ODMG does not support tuple-valued possible representation components (because it does not support the concept of possible representations at all); (f) ODMG tuple types have explicit names; (g) it is not clear when two ODMG tuple types are regarded as equal; (h) ODMG s tuple types appear to have a left-to-right ordering to their components; (i) most of the Manifesto s required tuple operators are not supported in the Object Model (though it might be possible to simulate them in OQL). Note: OQL (as opposed to the ODMG Object Model as such) does include a construct that seems to be somewhat more akin to our tuple selector.
7. Type generator RELATION
ODMG fails. The comments under RM Prescription 6 apply here also, mutatis mutandis. Note in particular that most of the operators of the relational algebra are not supported in the ODMG Object Model (though they can probably be simulated in OQL).
8. Equality
ODMG fails (probably). First, it distinguishes between identity and equivalence (sometimes called deep equality vs. shallow equality, though authorities disagree as to which is which);
CHAPTER 27 A COMPARISON BETWEEN ODMG AND THE THIRD MANIFESTO
second, it distinguishes between literals and objects. Both of these facts muddy the picture considerably. In addition, there does not appear to be any way to prevent users from defining an = operator with any semantics they please (note that no = operator, as such, is actually prescribed). However, it is least true that support for a SAME_AS operator, with prescribed semantics, is required for objects (though apparently not for literals); SAME_AS tests to see whether two objects are identical (i.e., have the same object ID).
9. Tuples
See RM Prescription 6.
10. Relations
See RM Prescription 7.
11. Scalar variables
ODMG conforms, partly. At least, it supports objects of (user-defined) atomic type T, and ODMG objects seem to be something like variables and ODMG atomic types seem to be something like scalar types. But the values of those scalar variables are not exactly values of type T, owing to the distinction ODMG draws between literal and object types (in fact, it is quite difficult to say what they are). Also, defining i.e., creating, via NEW a scalar variable (atomic object) does not appear to initialize that variable (atomic object).
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