XFA Specification Question: What is the difference between ancestor match and sibling match

Hello.
Please, tell what is the main difference between ancestor scope match and sibling scope match during data binding process.
I've read "XML Forms Architecture (XFA) Specification Version 3.0" pages 182-188 a few times and tried to find the main difference, but I couldn't.  

They are very different, actually.  Last.fm is essentially a tracking tool for your music plackback preferences.  Plus it's a web portal / forum for many music-related discussions.   It's cross-platform and thus very OS / device agnostic.
iTunes Match is a Matching service that takes your local music libaray (in iTunes) and "matches" them to whatever is in Apple's music database.   So, if you have a lot of older 128kps files, the hope is that they will be upgraded to 256kps AAC's. And it's also a "cloud" solution for your music, allowing you to keep not only your iTunes systems in sync but also your iOS devices.  But it's not cross-platform -- no Android support, no Linux support for example.

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