html metadata: a link to the ocda.db

The metadata page gains a line between the markup source and the
source digests.

(assisted by Claude-Code)

1 files changed, 17 insertions, 0 deletions

diff --git a/src/sisudoc/ocda/abstraction/load.d b/src/sisudoc/ocda/abstraction/load.d
index f429595..ebdd1a5 100644
--- a/src/sisudoc/ocda/abstraction/load.d
+++ b/src/sisudoc/ocda/abstraction/load.d
@@ -61,6 +61,23 @@ module sisudoc.ocda.abstraction.load;
        .ssp         + images   the abstraction, as text
        .ocda.db                the abstraction, sqlite, images inside
 
+     A source may also be remote. spine already takes a URL argument ending
+     in .zip: it is downloaded to a temp file (downloadZipUrl in
+     ocda/io_in/read_zip_pod.d, guarded by rgx_url_zip and by --allow-
+     downloads) and the local path is processed in its place. The same should
+     be offered for .ocda.db, which is the one other artefact that is
+     self-sufficient enough to be fetched on its own: it carries its images.
+     What that needs is small and is not done here:
+
+       - rgx_url_zip is `^https?://...[.]zip$`; a sibling pattern for
+         `[.]ocda[.]db$`, or one pattern covering both
+       - the same download path, which is already generic apart from that
+         regex, and the same temp-file cleanup
+       - dispatch, which this module already does once the file is local
+
+     A .ssp URL would want its images too, so it is a pod or a database that
+     travels, not a .ssp on its own.
+
      This module names those sources, tells them apart, and loads the two
      that are self-describing artefacts, returning the value the parser
      produces.