[DFDL-WG] clarification on when escape characters are needed
Tim Kimber
KIMBERT at uk.ibm.com
Wed Jun 19 04:29:48 EDT 2013
In the IBM implementation we have taken the view that the separator
defines the format for all of the group's content. That means that all
separators are counted as being significant, even if they occur within the
content region of the final group member.
I agree that other interpretations are possible - the MRM parser in
earlier versions of WebSphere Message Broker takes an infix separator out
of scope when it encounters the final declared child of a group.
I intend to address this point when I write up the rules for matching
string literals and delimiters.
regards,
Tim Kimber, DFDL Team,
Hursley, UK
Internet: kimbert at uk.ibm.com
Tel. 01962-816742
Internal tel. 37246742
From: Mike Beckerle <mbeckerle.dfdl at gmail.com>
To: dfdl-wg at ogf.org,
Date: 19/06/2013 03:52
Subject: [DFDL-WG] clarification on when escape characters are
needed
Sent by: dfdl-wg-bounces at ogf.org
Suppose I have a sequence. It has an infix separator which is "=".
<sequence dfdl:separator="=" dfdl:separatorPosition="infix">
<element name="a" type="xs:string"/>
<element name="b" type="xs:string"/>
</sequence>
Now, consider this data:
password=f82+=7&%q
I want
<a>password</a>
<b>f82+=7&%q</b>
Notice how the b element contains an '=' which was not escaped in any way
in the sequence. Element b is statically known to be last, the separator
is infix; hence, things are unambiguous even if there is no escaping.
However, there is an alternative interpretation, which is that the above
data should fail, because it produces <a>password</a><b>f82+</b> but then
does not find the expected stuff next. Rather it finds the '=7&%q' data.
In other words, the sequence separator divides the sequence content into 3
content regions, but there aren't 3 things to consume those, so it is a
processing error.
Which is correct?
--
Mike Beckerle | OGF DFDL Workgroup Co-Chair | Tresys Technology |
www.tresys.com
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