jsonschema - what is the difference between properties and patternProperties in json schema? -


for following json string : 

{     "abc" : 123,     "def" : 345 }

the following schema considers valid :

{     "$schema": "http://json-schema.org/draft-03/schema#",     "title": "my schema",     "description": "blah",     "type": "object",     "patternproperties": {         ".+": {             "type": "number"         }     } }

however, changing the patternproperties properties still considers valid. then, difference between these 2 tags?

for schema above properties should number. data invalid:

{ a: 'a' }

if replace patternproperties properties property '.+' should number. other properties can anything. invalid:

{ '.+': 'a' }

this valid:

{ a: 'a' }

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