Data import / export

[maxnth]

Add the possibility to import and export data

Input

• [x] Upload images (and potentially also PDFs) to a project
• [ ] Upload existing OCR-D workspaces
• [ ] Upload IIIF manifests
• [ ] Upload exported OCR4all projects (workspaces + metadata)
• [ ] Upload models (calamari, kraken, etc.)
• [x] Upload existing ground truth (as in PAGE XML files) and assign them to existing pages / projects

Export (as in export as download through the browser)

• [x] Export a single sandbox
• [x] Export a workspace for usage with ocr-d
• [ ] Export a whole OCR4all project (workspaces + metadata)
• [ ] Export trained models

[maxnth]

For snapshots exports it should be possible to optionally collect all images in the tree (see LAREX file collection) as well as to normalize file names to make them compatible with all operating systems @hbaier-dev

[maxnth]

Furthermore, we should – at least optionally – flatten the export structure of sandboxes as most users probably would prefer output in the form of

- mets.xml
- 1
- 1_1
- 1_1_1

instead of the current nested structure.