Calculation of a rectangles height and width

[maxnth]

I stumbled upon the following code regarding the calculation of height and width for rectangle:

prima-core-libs/java/PrimaMaths/src/org/primaresearch/maths/geometry/Rect.java

Lines 49 to 54 in d95dc0b

	public int getWidth() {
	return right-left+1;
	}
	public int getHeight() {
	return bottom-top+1;

Is there any specific reason for adding the constant factor of 1 to the calculated height/width?
When converting (for example) PAGEXML to ALTO the calculated width/height of TextBlocks is always one pixel too big because of this.

[chris1010010]

The interpretation of a rectangle in PAGE is that both the left and right border belong to the rectangle (same with top and bottom of course).
That means if a rectangle spans from left=5 to right=8, for example, then you have:
5,6,7,8 = 4 pixels. This equals 8-5+1

[bertsky]

Related: PRImA-Research-Lab/PAGE-XML#23 (comment)