PD calculation should be based on content, not edition

[kaplanmyrth]

line 4 of the ca.py module reads: "pubyear = edition.publish_year". This should calculate the pdyear based on the content, not on the edition, so this should be "pubyear = content.publish_year" (or whatever the variable is called).

Otherwise, the user should be able to drill down from any "edition" to the earliest "edition" of the same content.

If that function is not available, then any newer publication of a PD work will show up as being under copyright.

[David Strauss (davidstrauss)]

I'll need someone from OL to tell me what value to use from the schema, if any exists. I don't believe OL has been FRBRized yet, so there's probably no mechanism that would allow identifying the earliest publication date of content.

[rejon (rejon)]

This needs frbr'ization at the core of the system at Open Library. This depends on bug #181687.

[Greg Grossmeier (greg.grossmeier)]

critical as per Marcus' email

[rejon (rejon)]

Very close to this. Edward applying to PDR, then will have David look at making patch for this to work.