Add informative list of condition options

[nichtich]

A PAIA server SHOULD use the condition option id http://purl.org/ontology/dso#DocumentService or other URIs from the Document Service Ontology for condition options of type http://purl.org/ontology/paia#FeeCondition.

• http://purl.org/ontology/dso#Loan for loan fee (PAIA action "request")
  Item is being made into service status 3=held
  (German Ausleihe)
• http://purl.org/ontology/dso#Renew for renewal fee (PAIA action "renew").
  Item is kept longer in its current service status 1, 2, 3, or 4
  (German Verlängerung)
• http://purl.org/ontology/dso#RenewLoan for loan renewal fee (PAIA action "renew").
  Item is kept longer in its current service status 3 (=held).
  (German Verlängerung einer Ausleihe)
• http://purl.org/ontology/dso#Reservation for reservation fee (PAIA action "request")
  Item is being made into service status 2=reserved
  (German Vormerkung)
• http://purl.org/ontology/dso#Provision for fee to provide the document to be used by the user (PAIA action "request")
  Item is being made into service status 4=provided either directly or via transition of service status 1=ordered.
  (German Bestellung)

See also https://gbv.github.io/paia/paia.html#simple-data-types (service status) and https://gbv.github.io/paia/paia.html#transitions-of-service-states.

[shiphrah]

dso#Renew is not supported on LBS systems; we will only get dso#RenewLoan.

I don't think that dso#Provision and dso#Loan make sense together. You can not make an item transist to status 3=held via PAIA action "request". Either the item is in an open storage - so you will loan it at the desk or some self service station without interaction of PAIA - or it is in a closed storage so you can request it with PAIA - the transition from ordered to held can not be done with PAIA.

The fee is actually (at least for LBS) for the loan, not for the provisioning. I think we should stick with dso#Loan for this. The description is though not correct as outlined above.

[nichtich]

May be part of #76.