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Date: Sat, 9 Sep 2006 07:31:23 -0700 (PDT)
From: "Bryan Pendleton (JIRA)" <derby-dev@db.apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-1759) XMLSERIALIZE operator doesn't follow
 SQL/XML spec in some areas when serializing a sequence.
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    [ http://issues.apache.org/jira/browse/DERBY-1759?page=comments#action_12433602 ] 
            
Bryan Pendleton commented on DERBY-1759:
----------------------------------------

I intend to merge revision 441740 to the 10.2 branch today. The merge and build were clean.
I'm running some tests just to be sure.

> XMLSERIALIZE operator doesn't follow SQL/XML spec in some areas when serializing a sequence.
> --------------------------------------------------------------------------------------------
>
>                 Key: DERBY-1759
>                 URL: http://issues.apache.org/jira/browse/DERBY-1759
>             Project: Derby
>          Issue Type: Bug
>    Affects Versions: 10.2.1.0, 10.2.2.0, 10.3.0.0
>            Reporter: A B
>         Assigned To: A B
>             Fix For: 10.2.2.0, 10.3.0.0
>
>         Attachments: d1759_v1.patch, d1759_v1.stat
>
>
> The SQL/XML specification dictates that, when serializing a sequence of XML items, the XMLSERIALIZE operator must first "normalize" the sequence based on the rules defined here:
>   http://www.w3.org/TR/xslt-xquery-serialization/#serdm
> The current Derby implementation doesn't perform such normalization, which leads to two ways in which the results of an XMLSERIALIZE operator may not agree with the required behavior:
>   1. Sequences of atomic values will not have spaces between, but
>      the space is required as part of step 3 of the normalization
>      rules at the above link.
>   2. Derby will allow serialization of a sequence even if it has
>      a top-level Attribute node in it, but the rules of normalization
>      dictate that an error should be thrown instead (step 7).
> Both of these behaviors can be seen with the following query.
> values
>   xmlserialize(
>     xmlquery('/ageinfo/@*' passing by ref
>       xmlparse(
>         document '<ageinfo age="48" birthdate="1900-02-08"/>'
>         preserve whitespace
>       )
>       empty on empty
>     )
>     as char(50)
>   )
> Derby will currently return the following result from this statement:
> 1
> --------------------------------------------------
> 481900-02-08
> This result does not abide by SQL/XML specification because a) Derby allowed serialization of a sequence having a top-level attribute node (actually, the sequence had two), and b) the atomic values produced from the attributes were displayed without a space between them.
> The correct behavior for the above example is to return a serialization error caused by the presence of an Attribute node in the sequence.
> If the example was rewritten as, say:
> -    xmlquery('/ageinfo/@*' passing by ref
> +    xmlquery('fn:data(/ageinfo/@*)' passing by ref
> then the attribute nodes are no longer present--we only have their atomic values, which is allowed.  Thus the correct result should then be:
> 1
> --------------------------------------------------
> 48 1900-02-08
> Note, though, that Xalan doesn't appear to support the "fn:data" function, so this rewritten query won't actually work.  I tried using Xalan's built-in string function, as follows:
> -    xmlquery('/ageinfo/@*' passing by ref
> +    xmlquery('string(/ageinfo/@*)' passing by ref
> but Xalan only returns the first attribute in that case; it doesn't return the second one.  So part of this Jira issue is probably going to involve figuring out how to allow a user to retrieve a sequence of attribute *values* (as opposed to attribute nodes) using Xalan and still abide by the SQL/XML rules.

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