code: @Pure
  	public static double fromESRI_x(double x) throws IOException {
  		if (Double.isInfinite(x) || Double.isNaN(x)) {
  			throw new InvalidNumericValueException(x);
  		}
  		return x;
  	}
docs: Translate a x-coordinate from ESRI standard
  to Java standard.
  
  @param x is the Java x-coordinate
  @return the ESRI x-coordinate
  @throws IOException when invalid conversion.