code: public Double getBaseDouble()
      {
          return (this.value == null) || (this.uom == null)
                 ? null
                 : this.uom.getBaseDouble(((Number) this.value).doubleValue());
      }
docs: Converts the {@link #value} in a standardized value depended on defined
  {@link UoM#getNumerator() numerator} and {@link UoM#getDenominator() denominator}.
  
  @return standardized value
  @see #value
  @see UoM#getBaseDouble(Double)