Stable name for this example -- the element's id when it has one, else example-<n>.
The example's source text (e.g. a JSON or HTTP snippet), trimmed.
Link to this example in its source document. Absolute whenever a base URL
can be determined -- from --base-url, from a URL the document declares
about itself (ReSpec's edDraftURI, <base href>, <link rel=canonical>,
og:url), or from the URL that was fetched. Falls back to a bare fragment
(#example-1) when none of those are available.
Best-effort media type of content, e.g. "application/json".
A single example extracted from a spec document.
This is what extractExamples returns, and exactly what the CLI prints as one line of NDJSON.