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Re: [Serialization] SCHEMA-F (qt-2004Feb0266-01)

From: Henry Zongaro <zongaro@ca.ibm.com>
Date: Wed, 8 Sep 2004 10:55:18 -0400
To: Mary Holstege <holstege@mathling.com>
Cc: public-qt-comments@w3.org
Message-ID: <OF1664FEA9.DBCA90B2-ON85256F09.000E4224-85256F09.0051F76E@ca.ibm.com>

Mary,

     In [1], you submitted the following comment on the Last Call Working 
Draft of XSLT 2.0 and XQuery 1.0 Serialization on behalf of the XML Schema 
Working Group:

<<
[F] [Section 2: Serializing Arbitrary Data Models] The first paragraph of
this section states:

"An instance of the data model that is input to the serialization process 
is
a sequence. The serialization process must first place that input sequence
into a normalized form for serialization; it is the normalized sequence 
that
is actually serialized. The normalized form for serialization is 
constructed
by applying all of the following rules in order, with the initial sequence
being input to the first step, and the sequence that results from any step
being used as input to the subsequent step."

We think wording in this section tends to imply a required implementation,
which, given the destructive nature of the implementation described, leads 
to
the conclusion that serialized data models cannot subsequently be used for
anything else. We believe what is intended is the description of a mapping
between data models and normalized data models, without attempting to 
constrain
implementations. We request that the text in this section be recast in a 
more
declarative fashion to make these intentions clear.
>>

     Thanks to you and the working group for this comment.  The XSL and 
XML Query Working Groups discussed your comment, and decided to make the 
following changes to Section 2 of Serialization.  These changes are with 
respect to the July 23 draft of Serialization.[2]


o Change the second sentence of the first paragraph to make it clear
  that the process is not destructive:

<<
Prior to serializing a sequence using any of the output methods whose 
behavior is specified by this document (3 Serialization Parameters) the 
serialization process must first compute a normalized sequence for 
serialization; it is the normalized sequence that is actually serialized.
>>

o Reword the items in the numbered list so that it's clear that the
  result at each step is a new sequence:

<<
1. If the sequence that is input to serialization is empty, create a
sequence S1 that consists of a zero-length string.  Otherwise, copy each
item in the sequence that is input to serialization to create the new
sequence S1.

2. For each item in the sequence S1, if the item is atomic, obtain the 
lexical representation of the item by casting it to an xs:string and copy 
the string representation to the new sequence; otherwise, copy the item, 
which must be a node, to the new sequence. It is a serialization error if 
an atomic value cannot be cast to xs:string.  The new sequence is S2.

3. For each subsequence of adjacent strings in S2, copy a single 
string to the new sequence equal to the values of the strings in the 
subsequence concatenated in order, each separated by a single space.  Copy 

all other items to the new sequence.  The new sequence is S3.

4. For each item in S3, if the item is a string, create a text 
node in the new sequence whose string value is equal to the string; 
otherwise, copy the item to the new sequence.  The new sequence is S4.

5. For each item in S4, if the item is a document node, copy its 
children to the new sequence; otherwise, copy the item to the new 
sequence.  The new sequence is S5.

6. It is a serialization error if an item in S5 is an attribute 
node or a namespace node. Otherwise, cconstruct a new sequence, S6, that 
consists of a single document node and copy all the items in the sequence, 

which are all nodes, as children of that document node.

S6 is the normalized sequence.
>>

     May I ask you to confirm that this response is acceptable to the 
Schema working group?

Thanks,

Henry [On behalf of the XSL and XML Query Working Groups]
[1] 
http://lists.w3.org/Archives/Public/public-qt-comments/2004Feb/0266.html
[2] http://www.w3.org/TR/2004/WD-xslt-xquery-serialization-20040723/#serdm
------------------------------------------------------------------
Henry Zongaro      Xalan development
IBM SWS Toronto Lab   T/L 969-6044;  Phone +1 905 413-6044
mailto:zongaro@ca.ibm.com
Received on Wednesday, 8 September 2004 14:56:14 GMT

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