Hi Hans, thanks to your queries I also stumbled over this bug today :) https://sourceforge.net/tracker/?func=detail&atid=482468&aid=2668437&group_id=56967 It seems like some properties in the parent step are not set correctly. Regards, Jan On Mar 6, 2009, at 16:35, Hans van Rijswijk (DT) wrote:

Hi all,

Why does this xquery work:

let $result := doc("document.xml")//*[properties] let $astypes := distinct-values(for $n in $result/ancestor-or-self::*[properties] return name($n)) return $astypes <>

Whereas these xqueries don't:

let $result := doc("document.xml")//properties/.. let $astypes := distinct-values(for $n in $result/ancestor-or-self::*[properties] return name($n)) return $astypes <>

let $result := doc("document.xml")//properties/parent::* let $astypes := distinct-values(for $n in $result/ancestor-or-self::*[properties] return name($n)) return $astypes <>

The latter two xqueries return an error:

MAPI = monetdb@host:50000 QUERY = let $result := doc("document.xml")//properties/parent::* ERROR = !ERROR: ancestor-or-self: illegal data in size column or context list. !ERROR: PFll_ancestor_or_self: operation failed.

Which MonetDB expert can explain?

Regards, Hans v R

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-- Jan Rittinger Lehrstuhl Datenbanken und Informationssysteme Wilhelm-Schickard-Institut für Informatik Eberhard-Karls-Universität Tübingen http://www-db.informatik.uni-tuebingen.de/team/rittinger