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+status: wip
+
+HTML Ingest Pipeline
+========================
+
+Basic goal: given an ingest request of type 'html', output an object (JSON)
+which could be imported into fatcat.
+
+Should work with things like (scholarly) blog posts, micropubs, registrations,
+protocols. Doesn't need to work with everything to start. "Platform" sites
+(like youtube, figshare, etc) will probably be a different ingest worker.
+
+A current unknown is what the expected size of this metadata is. Both in number
+of documents and amount of metadata per document.
+
+Example HTML articles to start testing:
+
+- complex distill article: <https://distill.pub/2020/bayesian-optimization/>
+- old HTML journal: <http://web.archive.org/web/20081120141926fw_/http://www.mundanebehavior.org/issues/v5n1/rosen.htm>
+- NIH pub: <https://www.nlm.nih.gov/pubs/techbull/ja02/ja02_locatorplus_merge.html>
+- first mondays (OJS): <https://firstmonday.org/ojs/index.php/fm/article/view/10274/9729>
+- d-lib: <http://www.dlib.org/dlib/july17/williams/07williams.html> 
+
+
+## Ingest Process
+
+Follow base URL to terminal document, which is assumed to be a status=200 HTML document.
+
+Verify that terminal document is fulltext. Extract both metadata and fulltext.
+
+Extract list of sub-resources. Filter out unwanted (eg favicon, analytics,
+unnecessary), apply a sanity limit. Convert to fully qualified URLs. For each
+sub-resource, fetch down to the terminal resource, and compute hashes/metadata.
+
+Open questions:
+
+- will probably want to parallelize sub-resource fetching. async?
+- behavior when failure fetching sub-resources
+
+
+## Ingest Result Schema
+
+JSON should be basically compatible with existing `ingest_file_result` objects,
+with some new sub-objects.
+
+Overall object (`IngestWebResult`):
+
+- `status`: str
+- `hit`: bool
+- `error_message`: optional, if an error
+- `hops`: optional, array of URLs
+- `cdx`: optional; single CDX row of primary HTML document
+- `terminal`: optional; same as ingest result
+    - `terminal_url`
+    - `terminal_dt`
+    - `terminal_status_code`
+    - `terminal_sha1hex`
+- `request`: optional but usually present; ingest request object, verbatim
+- `file_meta`: optional; file metadata about primary HTML document
+- `html_biblio`: optional; extracted biblio metadata from primary HTML document
+- `scope`: optional; detected/guessed scope (fulltext, etc)
+- `html_resources`: optional; array of sub-resources. primary HTML is not included
+- `html_body`: optional; just the status code and some metadata is passed through;
+  actual document would go through a different KafkaTopic
+    - `status`: str
+    - `agent`: str, eg "trafilatura/0.4"
+    - `tei_xml`: optional, str
+    - `word_count`: optional, str
+
+
+## New SQL Tables
+
+`html_meta`
+    sha1hex (primary key)
+    updated (of SQL row)
+    status
+    scope
+    has_teixml
+    has_thumbnail
+    word_count (from teixml fulltext)
+    biblio (JSON)
+    resources (JSON)
+
+Also writes to `ingest_file_result`, `file_meta`, and `cdx`, all only for the base HTML document.
+
+
+## Fatcat API Wants
+
+Would be nice to have lookup by SURT+timestamp, and/or by sha1hex of terminal base file.
+
+`hide` option for cdx rows; also for fileset equivalent.
+
+
+## New Workers
+
+Could reuse existing worker, have code branch depending on type of ingest.
+
+ingest file worker
+  => same as existing worker, because could be calling SPN
+
+persist result
+  => same as existing worker; adds persisting various HTML metadata
+
+persist html text
+  => talks to seaweedfs
+
+
+## New Kafka Topics
+
+HTML ingest result topic (webcapture-ish)
+
+sandcrawler-ENV.html-teixml
+    JSON wrapping TEI-XML (same as other fulltext topics)
+    key compaction and content compression enabled
+
+JSON schema:
+
+- `key` and `sha1hex`: str; used as kafka key
+- `status`: str
+- `tei_xml`: str, optional
+- `word_count`: int, optional
+
+## New S3/SeaweedFS Content
+
+`sandcrawler` bucket, `html` folder, `.tei.xml` suffix.
+