Hi All,
Does anyone have any input on this? I've used several other regular
_expression_ engines, and they treat '.' within a character group as
representing a literal '.' character, not "all characters".
The XML Schema specification states
(http://www.w3.org/TR/xmlschema-2/#nt-posCharGroup) that a posCharGroup
is:
'.' is a valid charRange. Shouldn't it be considered a charRange
rather than a charClassEsc since it matches on charRange and the rest
of the posCharGroup parses successfully?
Regards,
Andrew
Andrew Tosh wrote:
Hi All,
I am using libxml2's regular _expression_ engine to validate XML Schema
instances against pattern constraints.
I have run into a situation where either the W3C specification seems
ambiguous, or libxml2 is doing something wrong. My schema has a
pattern constraint "[^.:/]+", meaning one or more characters which is
not a period, colon, or slash. XSV validates the attached document,
but libxml2 considers '.' to represent the multi-character escape for
all characters except newline.
http://www.w3.org/TR/2000/WD-xmlschema-2-20000407/#dt-poschargroup
defines the meaning of a character group in an XML Schema regular
_expression_. The '.' character is both a member of R (defined as any
XML character that is not '[', ']', or '\' and that doesn't create a
range) and E, where it represents any character. I would think R
appearing before E in the table means an application should try and
match against the rules for R first, and that '.' should not have to be
escaped within a character group.
Please let me know what you think, and if there is some consensus, I
will submit a patch.
Regards,
Andrew
<?xml version="1.0" encoding="utf-8"?>
<testElem xmlns="http://obj-sys.com/mySchema">value</testElem>
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Andrew Tosh
Objective Systems, Inc.
REAL WORLD ASN.1 AND XML SOLUTIONS
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