152.5.4 Reference lists[//]

Reference lists are used during the automatic creation of index terms (e.g. for author names with prefixes like van den broek, 't hart, de la fontaine). The entries in these lists ensure there will be additional entries in the index.

So basically reference lists are the opposite of stopword lists. But:
If you have a general stopword list that includes for instance the French leading article "LA", this ensures this term will be ignored when indexing and searching for 'la maison'. If you also have a reference list for author names that also has the French leading article "LA", it means you will be able to search for and retrieve the author "la fontaine".

They are also language dependant (see stopword lists above for an explanation).

Once a reference list has been defined, it can be associated with a mechanism set.

152.5.5 Character lists[//]

In character lists you can define a list of characters that can be used as part of a mechanism set (see above). When you use the mechanism list ReplaceCharacter all characters as defined in the list will be replaced by a blank. When you use the mechanism list RemoveCharacter all characters as defined in the list will be removed from the string to be indexed.

152.6 Relations[//]

The fourth part of AFO 151 is Relations. Relations deals with the link that can be made between various records in the same database.

Contrary to bibliographic records there is only a small set of possible relations for authority records. For the SmartAuthorities format this is only for see and see-also references.

Relations are always reciprocal. When you create a reference to another record the reciprocal relation is created automatically in that record.

Cars see also automobiles: Both terms may be used. When you create the relation for cars, a reciprocal reference from automobiles to cars is made.

Automobiles see cars: Cars is the preferred term. When you create a see reference with automobiles, a see from reference will be created for cars.

Cars see from automobiles: Cars is the preferred term. When you create a see from reference with cars, a see reference will be created from automobiles.