Fraction Attributes

Attribute type id	Type specific restriction parameters
fraction	minValue: Minimum fraction value (inclusive)
	maxValue: Maximum fraction value (inclusive)
	patterns: List of patters that the value must match (Java Pattern). Values has to match all the patters. Pattern is only matched against the attribute value - without unit.
	units: List of possible units to use (units have to be defined in `unitsOfMeasure` section of datastandard)

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All restrictions are validated in provided order.
Attribute validation will fail on the first unfulfilled restriction.
Accepted are fraction values (i.e. 1/2) and decimal values (i.e. 0.5).

Code Examples:

{
  "id" : "WRENCH_HEAD_SIZE_INCH",
  "name" : "Wrench Head Size (inch)",
  "type" : {
    "id" : "fraction",
    "restriction" : {
      "parameters" : {
        "minValue" : "1 / 64",
        "maxValue" : "99"
      }
    }
  }
}

Attribute fractionAttribute = AttributeBuilder
        .fractionAttribute("WRENCH_HEAD_SIZE_INCH", "Wrench Head Size (inch)")
        .withMinValue(BigFraction.getReducedFraction(1, 64))
        .withMaxValue(new BigFraction(99))
        .build();