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for b in bib0/book do book [ b/author, b/title ] ==> book [ author [ "Abiteboul" ], author [ "Buneman" ], author [ "Suciu" ], title [ "Data on the Web" ] ], book [ author [ "Fernandez" ], author [ "Suciu" ], title [ "XML Query" ] ] : book [ author[ String ]{1,*}, title[ String ] ]{0,*}
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