XXX: Why o Why!
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$elt->first_child( 'title')
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$elt->first_child( 'p[@class="title"]')
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$elt->first_child( 'p[text()= "Definitions"]'
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$elt->first_child( 'p[@class="title" and @level < 2]')
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$section->first_child( 'title[text()="Definitions" and @level=2]')
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...
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It started simple, but eventually grew out of control
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No one ever complained about it.