References

• AAI-CCVPN Schema Proposal for Casablanca Release
• AAI-BBS Proposals for Dublin Release /  AAI-2154 - Getting issue details... STATUS

Principles

tbc

Discussion

From BBS use case

In general, first option is written as "add <new attribute> to <class>".

• First justification for this action is that the <new attribute> is more generally applicable to other uses, not just this one case.
• Second justification is that it will be used in high percentage of cases (not left empty) and have additional properties such as being mandatory.
• Third justification is that there will be core code written that depends on this attribute, so it should be a core part of the schema
• Fourth justification is that the exact nature and number of <new attributes> is well-known, so it will not require frequent schema changes to adjust to the conditions.

In general, the second option is written as "add Metadata sub-object then configure <new attribute> Metadatum entry".

• First justification for this action is that the <new attribute> is more specifically applicable to this one case only.
• Second justification is that it will be left empty in high percentage of cases, i.e. not mandatory.
• Third justification is that there will be none of the core code depends on this attribute, but the information needs to be conveyed somehow
• Fourth justification is that the exact nature and number of <new attributes> is variable or unbounded, so this avoids frequent schema changes to adjust to the conditions.

In general, the third option is written as "configure <new attribute> Metadatum entry linked from service-instance into relationship-list".

• First justification for this action is that schema change is to be avoided as much as possible.
• Second justification is that the <new attribute> is more specifically applicable to this one case only
• Third justification is that it will be shared/linked/referred from several other objects via the relationship-list
• Fourth justification is that there will be none of the core code depends on this attribute, but the information needs to be conveyed somehow
• Fifth justification is that the exact nature and number of <new attributes> is variable or unbounded.

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