SSDN - Bug in Stylus XQuery Mapper (the order of how the elements are added/removed affect the XQuery source generated)

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Klarinda GW

Subject: Bug in Stylus XQuery Mapper (the order of how the elements are added/removed affect the XQuery source generated)
Author: Klarinda GW
Date: 18 Apr 2006 02:28 AM

Hi, I found a little bug in Stylus XQuery Mapper.

The order of how the elements are added/removed affect the XQuery source generated, such as the binding of the variables, for example “add A, add B, delete A” and “add B” may yield different result.

Let's take for example W3C Query 1.1.9.5 Q5 (http://www.w3.org/TR/xquery-use-cases/#xmp-queries-results-q5)

- Add bib/book/title to FOR and add reviews/entry/title to FOR (Stylus will generate $title and $title1)

- Add conditional block = where the inputs are bib/book/title and reviews/entry/title and the output is to WHERE (Stylus will generate $title = $title1)

- Link the FLWOR output to book-with-prices

- Create Copy Link bib/book/title to child of “book-with-prices” (Stylus will generate <book...> $title </book...>)

Look at first figure

- After that delete edges between bib/book/title--FOR and reviews/entry/title--FOR and replace them with bib/book--FOR and reviews/entry--FOR (Stylus will generate “for $book in... , $entry in... where $title=$title1 return <book...>$title</book...>"; Note that variable $title and $title1 do not exist as there is no binding for $title and $title1

Look at second figure

Stylus_Q5_error01.jpg
Bug step 01

Stylus_Q5_error02.jpg
Bug step 02

Minollo I.

Subject: Bug in Stylus XQuery Mapper (the order of how the elements are added/removed affect the XQuery source generated)
Author: Minollo I.
Date: 18 Apr 2006 09:03 AM

This is a current limitation of the XQuery mapper implementation; you will have to remove/recreate the "where" and "copy" links to get a fully updated XQuery.

Minollo

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