Apply content-type classifications to a file and set attribute values (metadata) on it. This is how you tag a document with structured metadata from your content-type schema.

Typical workflow:

1. Classify the file: {"action": "classify", "content_type_path": "legal:contract:nda"}
2. Set attribute values: {"action": "set_value", "content_type_path": "legal:contract:nda", "attribute_name": "jurisdiction", "value": ["FR", "DE"]}
3. Read back with GET /api/v3/files/{file_id}/facets

A file can be classified under multiple content types. Just call classify for each one. Removing a classification (unclassify) cascades: all attribute values under that content type are removed too.

Actions:

• classify: assign a content type to the file (idempotent)
• unclassify: remove a content type and all its attribute values
• set_value: set or update an attribute value (the content type must be classified first)
• clear_value: remove an attribute value

Value types for set_value:

• text / rich-text → string
• number → number or numeric string
• date → date string, normalized to YYYY-MM-DD
• boolean → true / false
• select → one string from choices
• multi-select → array of strings from choices

To clear a value, use clear_value (not set_value with null).

Prerequisites: Content types must be set up first. See GET /api/v3/content-types/templates (browse templates) and POST /api/v3/content-types (adopt or create).

Requires edit access to the file.