GT guidelines: implement and open for community contributions

[bertsky]

In their current form, the OCR-D transcription guidelines are often of little use to annotators looking for answers or guidance. They are written top-down intellectual accounts, but not formal (i.e. runnable/verifiable) and not searchable and – well, quite incomplete. Although many examples are given already, this is not nearly enough for the diverse set of materials and pecularities which annotators face (esp. those without a bibliological / humanities background).

How can we improve that?

I propose attacking this on multiple levels:

• [x] first fixing #225 and #207 (and perhaps #102)
• [ ] finally starting a software implementation (which can normalize arbitrary text input at each GT level or canonicalize to the next lower level)
• [ ] opening up the repository for comments and amendments by users/practitioners (perhaps in the same way that the workflow guide was mirrored to the wiki and gets synchronized back every now and then)
• [x] supplementing https://ocr-d.de/en/gt-guidelines/trans/ocr_d_koordinationsgremium_codierung.html and https://ocr-d.de/en/gt-guidelines/trans/trFremdsprache.html with data columns for all GT levels (for quick lookup)
• [ ] starting a public glyph repository by aggregating diverse textual GT, enriching it with glyph coordinates via OCR (e.g. Tesseract 3 segmenter) forced alignment, and extracting glyph image-text file pairs
• [ ] tying the website to the glyph repo with a dedicated search interface: text→image search and image→text search (via image similarity like in Newspaper Navigator)

[bertsky]

• opening up the repository for comments and ammendments by users/practitioners (perhaps in the same way that the workflow guide was mirrored to the wiki and gets synchronized back every now and then)

It's not as convenient as a Wiki (with direct preview), and not as conventient as editing Markdown files on Github (with direct preview), but perhaps users can just fork/edit the gt-guidelines repo?

• finally starting a software implementation (which can normalize arbitrary text input at each GT level or canonicalize to the next lower level)

Existing places to look for (just off my head):

• Calamari text regularizer rules
• cor-asv-ann-evaluate character equivalences
• GT4HistOCR/tools/regularize.pl (with care!)
• IMPACT ocrevalUAtion character equivalences
• Ocropus1 replacements und Ocropus1 whitespace rules
• Tesseract string normalization and Tesseract grapheme/language validation

[kba]

ping @tboenig once he's back from vacation