Hi Daniel,
Daniel Veillard <veillard redhat.com> writes:
> Le'ts be frank, it's a bit of FUD, Schemas is being
implemented, it's
> not fully implemented because the spec is basically
broken beyond recovery.
I thought it is because Kasimier is missing in action  . But, I
agree,
XML Schema is not the easiest spec to read.
> ... SAX not formerly defined except for Java. On the
other hand the
> XMLTextReader from C# is part of the ECMA C# spec, and
is a good API.
You mean SAX, which is only defined for Java, is a bad thing
but
XMLTextReader, which is only define for C#, is good?
> Also DOM *requires* UTF-16 for all strings. This
means that in general
> 1/ you will loose time, most content around is UTF-8
> 2/ you will loose memory space/cache efficiency as the
converted output is
> way larger in average
> 3/ you will looose CPU efficiency as breaking cache is
#1 performance
> problem in modern computers
I think it largely depends on what kind of data one is
handling. If there
are a lot of non-latin characters then UTF-8 will waste at
leaset as much
and normally a lot more (4-byte surrogate pairs) space than
UTF-16.
> There is no functional XSD validator. Go to the
xmlschemas-dev
> archive at W3C, check the last 5 questions from Michael
Kay (who is
> a Schemas implementor and one of the W3C spec writers),
they are unanswered
> for weeks now, nobody can tell what it is supposed to
do. Trying to use
> XSD to promote interoperability or validation of data
is kind of a joke.
> Relax-NG on the other hand is an ISO standard, has a
formal specification
> and can be read and understood by most programmers in a
matter of a couple
> of days.
While what you say could be true, most XML parsers these
days support
XML Schema while there is hardly any that support Relax-NG.
Also there
are a lot of industry standards organizations that managed
to define
interoperable schemas that describe fairly complex XML
vocabularies.
Finally, one last thing, that a lot of people tend to
overlook, is that
it is fairly straightforward (in most cases) to provide XML
data
binding (generated types in a programming language that
represent the
given vocabulary) from XML Schema. I do not think it will be
anywhere
as easy or at all possible to do the same with Relax-NG.
hth,
-boris
--
Boris Kolpackov
Code Synthesis Tools CC
http://www.codesynthesis
.com
Open-Source, Cross-Platform C++ XML Data Binding
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