Anchor
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Allows named anchors to be defined that are not relative to the position in the schema (they are relative to the baseUri of the schema in which they are defined).
So if you have a schema "c:\myschema.json" you set "$anchor" : "foo" on a schema object within that file, then you can address that schema object using "$ref": "#foo".
$anchor effectively makes the qualified name of the schema <BaseUri>#foo
If present, the value of this keyword MUST be a string, which MUST start with a letter ([A-Za-z]), followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), or periods (".").
See Also