The ancestor, descendant, following, preceding and self axes partition a document (ignoring attribute and namespace nodes): they do not overlap and together they contain all the nodes in the document.

//GGG/ancestor::*

<AAA> <BBB> <CCC/> <ZZZ/> </BBB> <XXX> <DDD> <EEE/> <FFF> <HHH/> <GGG> <JJJ> <QQQ/> </JJJ> <JJJ/> </GGG> <HHH/> </FFF> </DDD> </XXX> <CCC> <DDD/> </CCC> </AAA>
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//GGG/descendant::*

<AAA> <BBB> <CCC/> <ZZZ/> </BBB> <XXX> <DDD> <EEE/> <FFF> <HHH/> <GGG> <JJJ> <QQQ/> </JJJ> <JJJ/> </GGG> <HHH/> </FFF> </DDD> </XXX> <CCC> <DDD/> </CCC> </AAA>
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//GGG/following::*

<AAA> <BBB> <CCC/> <ZZZ/> </BBB> <XXX> <DDD> <EEE/> <FFF> <HHH/> <GGG> <JJJ> <QQQ/> </JJJ> <JJJ/> </GGG> <HHH/> </FFF> </DDD> </XXX> <CCC> <DDD/> </CCC> </AAA>
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//GGG/preceding::*

<AAA> <BBB> <CCC/> <ZZZ/> </BBB> <XXX> <DDD> <EEE/> <FFF> <HHH/> <GGG> <JJJ> <QQQ/> </JJJ> <JJJ/> </GGG> <HHH/> </FFF> </DDD> </XXX> <CCC> <DDD/> </CCC> </AAA>
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//GGG/self::*

<AAA> <BBB> <CCC/> <ZZZ/> </BBB> <XXX> <DDD> <EEE/> <FFF> <HHH/> <GGG> <JJJ> <QQQ/> </JJJ> <JJJ/> </GGG> <HHH/> </FFF> </DDD> </XXX> <CCC> <DDD/> </CCC> </AAA>
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//GGG/ancestor::* \| //GGG/descendant::* \| //GGG/following::* \| //GGG/preceding::* \| //GGG/self::*

<AAA> <BBB> <CCC/> <ZZZ/> </BBB> <XXX> <DDD> <EEE/> <FFF> <HHH/> <GGG> <JJJ> <QQQ/> </JJJ> <JJJ/> </GGG> <HHH/> </FFF> </DDD> </XXX> <CCC> <DDD/> </CCC> </AAA>
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