Stance (of a source)

What one screened source does for one question, with a required statement of what it does not establish.

The stances are answers, partly answers, contradicts, background and not relevant; contradiction is as valuable as support. Each source also records "not settled", the honest limit that stops "relevant" from being read as "sufficient". Sources are read in windows of bounded size because a long paper does not fit one call; a partial read is disclosed, never passed off as a full one. A quote is checked against the stored text by exact match, and an approximate quote is shown as unverified rather than hidden.