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Some notes on Location Types for Item and Holding records 

• most items item records to do not have permanent location (that field is blank); but they all have an "effective location"
  • the item effective location will be the item's temporary location (if there is one - most records don't have this) or the parent holdings record's effective location (in nearly all cases, the holdings effective location is the holdings permanent location)
• the item record's effective location is inherited location inherits its effective location from the holdings record
• (there should be as many holdings records as there are items) – not sure about this
• for example, 3 copies of a book each have their own holdings record and their own item record
  • generally, the holdings permanent location will only be listed on theholdings records for the 3 copies of the book, not the item records 
• volumes will have one holding record and an item record for each volume 

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