module.exports.PositiveLengthStyleValueType = new StyleValueType(); // value is a ParsedValue whose value (once resolved) is a number in 96dpi pixels, >=0
module.exports.PositiveLengthOrAutoStyleValueType = new StyleValueType(); // value is a ParsedValue whose value (once resolved) is either a number in 96dpi pixels (>=0) or null (meaning 'auto')
module.exports.PositiveLengthOrInfinityStyleValueType = new StyleValueType(); // value is a ParsedValue whose value (once resolved) is either a number in 96dpi pixels (>=0) or Infinity