\input zb-basic
\input zb-ioport
\iteman{io-port 70670459}
\itemau{Abiteboul, Serge}
\itemti{Querying semi-structured data}
\itemso{ICDT, 1-18 (1997).}
\itemcc{}
\itemut{}
\itemli{doi:10.1007/3-540-62222-5\_33}
\end