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Usage events are good to use as a control mechanism for the aggregation database to check if duplicate events are harvested. The provenance information of the repository can be found in the <resolver> element, see section 4.1.6. - Peter |
| Note |
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Some internet fora argue that the same MD5 hash can be produced by the same strings, thus not globally unique, and thus cannot be used as a primary key in a global system. SHA-1 is a better method for encrypting the content (better protection against IP address hacking??), some prefer GUID's/UUID's for better global uniqueness. Others say that MD5 collisions occur very rarely. http://stackoverflow.com/questions/221165/pros-and-cons-of-using-md5-hash-of-uri-as-the-primary-key-in-a-database |
Occurences of child elements in <context-object>
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