JSON schema keyword support

MetaConfigurator supports JSON schema version 2020-12, although our GUI editor does not fully support all keywords of this draft. This table shows the support status for all keywords. Not that we use ajv for schema validation, so for the validation, all keywords are fully supported.

Keyword	Support status	Remarks
$ref	partial	No support for references to URLs or local files,
$anchor	not supported
$dynamicRef	not supported
$dynamicAnchor	not supported
$comment	full	Shown in the tooltip.
prefixItems	not supported
items	full
contains	full	Only relevant for schema validation.
additionalProperties	full	Users can add new properties to objects.
properties	full	Properties are shown in the GUI editor.
patternProperties	full	Users can add new properties to objects.
dependentSchemas	full	Dependent schemas are applied depending on the data.
propertyNames	full	Only used in schema validation.
if	full	if the if-schema is valid, the then schema is applied, otherwise the else schema
then	full
else	full
allOf	partial	merging allfs is limited to some keywords, we use the mergeAllOf library
anyOf	partial	users can select multiple sub-schemas that should be applied. Usage in combination with oneOf is not supported.
oneOf	partial	users can select a sub-schema that should be applied. A pre-selection is made that matches the data.
not	not supported
unevaluatedItems	not supported
unevaluatedProperties	not supported
type	full	Depending on the type, a corresponding component is shown to edit a property, e.g., a text field for strings. Type unions are converted to oneOfs.
const	full	Shown as drop-down with one entry.
enum	full	Shown as drop-down with the possible values as entries.
multipleOf	full	Used for validation and for the increment/decrement buttons of numeric text fields.
maximum	full	Only relevant for schema validation.
exclusiveMaximum	full	Only relevant for schema validation.
minimum	full	Only relevant for schema validation.
exclusiveMinimum	full	Only relevant for schema validation.
maxLength	full	Only relevant for schema validation.
minLength	full	Only relevant for schema validation.
pattern	full	Only relevant for schema validation.
maxItems	full	Users cannot add items to arrays that already reached their maximum number of items (in the GUI editor).
minItems	full	Only relevant for schema validation.
uniqueItems	full	Only relevant for schema validation.
maxContains	full	Only relevant for schema validation.
minContains	full	Only relevant for schema validation.
maxProperties	full	Users cannot add properties to objects that already reached the maximum number of properties (in the GUI editor).
minProperties	full	Only relevant for schema validation.
required	full	Required properties are marked with an asterisk and cannot be deleted in the GUI editor.
dependentRequired	full	If necessary, the dependent required properties are marked with an asterisk and cannot be deleted in the GUI editor.
title	full	Shown in the tooltip.
description	full	Shown in the tooltip.
default	full	Shown in the tooltip and potentially used as placeholder for the input fields.
deprecated	full	Shown as strike-through.
readOnly	not supported	Usually not relevant for editing files.
writeOnly	not supported	Usually not relevant for editing files.
examples	full	Shown in the tooltip. If two or more examples are given, a drop-down is used as component so the user can select on of the examples.
format	partial	Only used in validation, no format specific components.
contentEncoding	not supported
contentMediaType	not supported	Only schema validation.
contentSchema	not supported	Only schema validation.
dependencies	not supported	Deprecated in draft 2020-12, will not be supported.
$recursiveAnchor	not supported	Deprecated in draft 2020-12, will not be supported.
$recursiveRef	not supported	Deprecated in draft 2020-12, will not be supported.