schema_rules.txt

*some keywords only apply to some types
*some keywords are influenced by the presence of other keywords


*numeric types:
    -multipleOf => a JSON number, strictly greater than 0.
    -maximum => a JSON number.
    -exclusiveMaximum => a boolean, "maximum" should be present
    -minimum => a JSON number.
    -exclusiveMinimum => a boolean, "minimum" should be present
*strings:
    -maxLength => an integer, greater than or equal to 0
    -minLength => an integer, greater than or equal to 0
    -pattern => regular experession according to ECMA 262 
*arrays:
    -additionalItems => a boolean or an object. the object must be a valid JSON schema.
    -items => an object or an array. if an object it must be a valid JSON schema. if it is an array, items must be object with a valid schema.
    -maxItems => an integer, greater than or equal to 0.
    -minItems => an integer, greater than or equal to 0. 
    -uniqueItems => a boolean.
*objects:
    -maxProperties => an integer, greater than or equal to 0.
    -minProperties => an integer, greater than or equal to 0.
    -required => an array, at least one element. elements must be strings and unique.
    -additionalProperties => a boolean or an object. an object must be a valid schema.
    -properties => an object with a valid schema.
    -patternProperties => an object. each property name of the object should be a valid regular expression. each property value must be an object with a valid JSON schema.
    -dependencies => an object, each value must be either an object (valid schema) or an array (at least one element. each element must be a string and unique).
*any type:
    -enum => an array. at least one element. elements must be unique.
    -type => either a string or an array. elements of the array MUST be strings and MUST be unique. string values must be one the seven primitive types defined by the core spec.
    -allOf => an array. at least one element. elements must be objects with a valid JSON schema.
    -anyOf => an array. at least one element. elements must be objects with a valid JSON schema.
    -oneOf => an array. at least one element. elements must be objects with a valid JSON schema.
    -not => an object with a valid JSON schema.    
    -definitions => an object with a valid JSON schema.
    
*meta keywords:
    -title => a string.
    -description => a string.
    -default => no restrictions.
    -format: a string.
        *date-time
        *email
        *hostname
        *ipv4
        *ipv6
        *uri