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Posted to derby-dev@db.apache.org by "A B (JIRA)" <de...@db.apache.org> on 2006/08/24 22:16:52 UTC
[jira] Updated: (DERBY-1759) XMLSERIALIZE operator doesn't follow
SQL/XML spec in some areas when serializing a sequence.
[ http://issues.apache.org/jira/browse/DERBY-1759?page=all ]
A B updated DERBY-1759:
-----------------------
Fix Version/s: 10.2.2.0
10.3.0.0
> 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, 10.3.0.0, 10.2.2.0
> Reporter: A B
> Fix For: 10.3.0.0, 10.2.2.0
>
>
> 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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