Multiline string fields

Some strings are more equal than others, so we should have <input type="text"> and <textarea>. The latter is for multiline strings, which we possibly might want to interpret as markdown?

I'd like to capture this in the schema, so custom fields can also specify it. I see several options:

1. Add format: 'multiline'. This format is not really restricting type: 'string' (but must it be?).
2. Add format: 'markdown'. Not sure we really want Markdown always. Especially when importing from external formats where the value might be invalid markdown. May be better to add Markdown fields separately later.
3. In the spirit of plexus-form x-ordering and x-hints, add something like x-display: 'multiline'.
4. Alternatively, we can turn it around. Add format: 'singleline' or regex: '^[^\n]*$' to all single line string fields. But that would be quite verbose and ugly.

When using properties not in JSON Schema, I think you should actually extend JSON Schema with them. I'd prefer not to go there.

I think I prefer the first option.

• JSON Schema validation -- Semantic validation with "format"
• "format" in JSON Schema v3
• Proposed "format" values