hasLanguageTag checker

[pkiraly]

It should check if the data element has language attribute. I should have the following values:

• allOf: all instances should have language attribute
• anyOf: at least one instance should have language attribute
• oneOf: only instance should have language attribute

An example:

data:

{
  "id":"Portrait",
  "description":{
    "de":["Portr\u00e4t"],
    "zh":["\u8096\u50cf"]
  }
}

schema:

format: JSON
fields:
 - name: description
   path: $.['description']
   asLanguageTagged: true
   rules:
     - hasLanguageTag: allOf