There are many Lead attributes in the UI, but some do not appear to be recognized by SOAP.
For instance, "Job Title". I see it in the UI, but if I attempt to set it via SOAP I get "Unknown lead field".
If I set "Job Title" in the UI, that field is still not included in Leads retrieved by SOAP.
(EDIT: I'm mistaken, it's there, under "Title".)Thus, it appears that "Job Title" is kind of a second-class attribute.
How can I know what attributes can be used by SOAP?