Resource: Wikipedia (English)
|Institution:||Wikimedia Foundation, San Francisco, California, USA|
|Example access URL:||http://en.wikipedia.org/wiki/SM_UB-81|
|Parent data collection:||Wikipedia (En)|
This restriction is associated with data collections whose published identifier scheme does not follow the recommended requirements. For example, such identifiers may contain too much semantic information which could hinder their future stability (such as been composed of words or partial sentences). Users should consult the specific documentation given by the data provider.
The reason why this restriction is associated with the parent data collection is:
Identifiers are formed of descriptive text, and may not be unique, in which case a disambiguation page is returned.
For more information, please refer to: documentation on disambiguation process