PageExtractor.Algo.XPath.Query: XPath query generation
PageExtractor.Algo.XPath.Query: XPath query generation

Takes {depth, depth_reversed, tag, classes, position} n-uples.
tag and position can be undefined
classes can be an empty array.

Works either with the depth or the reversed depth.

Can go back up N parents.

Can be ORed.

NOTE:
* Copy does not copy the ORed queries, only the current part.

Next step:
* Using this in Algo.learn() for the first query and recursively.

ofavre/PageExtractor