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About Node Positions
The node positions for a node set start with 1. Evaluation of the position number is always based on document order. For example, the following query returns the first author element in the current context:
The next query finds the author elements (in the current context) that contain a first-name element. The query returns the third such author element.
When you specify an integer in brackets, it is equivalent to calling the position() function. For example, the following queries both return the third y child element of each x child element in the current context:
Tip: If you do not know the position of the node you want, a call to the position() function might help you. See Determining the Position Number of a Node.
The return value of the position() function depends on the specified axis. For example, suppose the axis is one of the reverse axes, such as preceding, ancestor, or preceding-sibling. The position() function returns the nth one in reverse document order that falls in the specified axis.
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