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One change for a big difference - a suggestion
Here is a change that would increase the hit rate dramatically. When a stdnbr or owi Classify search returns a '4' code for multiple works, use this call to get the DDC/LC for the most popular work:
Classify.oclc.org/classify2/ClassifyDemo?wi=xxxxxx
where "wi" is an attribute of Work, as in:
<work author="Guggenbühl-Craig, Adolf" editions="63" format="Book" holdings="593" hyr="2020" itemtype="itemtype-book" lyr="1971" owi="646433" schemes="DDC LCC NLM" title="Power in the helping professions" wi="2486691"/>
It is not obvious that this is available in the API, looking at the website, but it is how the Classify demo site does its magic when you click on a work.
Importantly, you cannot put the wi number in the stdnbr field bc sometimes you will also get back an owi that matches.
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