* @return An SVGLength. The length is always converted in PX.
* @throws ParseException If a problem occurs or if not managed unit are parsed (%, em and ex).
*/
public SVGLength parseLength() throws ParseException {
final double value = parseNumber(false);
final LengthType lgthType;
final String errorUnit = "Invalid unit";//$NON-NLS-1$
final String valueAsStr;
setPosition(0);
valueAsStr = parseNumberAsString(false);