Re: [Vtd-xml-users] design question/best practice

[Tatu S. <cow...@ya...>]

--- Jimmy Zhang <cra...@co...> wrote:

> Tatu, when detecting XML encoding types, which are
> currrently supported
> by Woodstox?? Examples below:
> 
> encoding="cp-1250"
> encoding="cp1250"
> encoding="windows-1250"
> encoding="win-1250"
> 
> It seems there can be many different types of
> encoding values...

Yes. Woodstox offers 2 levels of encoding support:
first one is "native" support, in which Woodstox
actually has its own decoder implementations, and then
fallback handling that uses JDK-provided decoders.
Set of natively supported decoders is quite small:
just ISO-Latin1 (8859-1), Ascii (7-bit), UTF-8, UTF-32
and UTF-16 (last one with partial native support).

But I do think JDK actually supports ones you listed;
about the only encoding I know that will not work is
IBM's EBCDIC, and I haven't received requests for
supporting any additional ones. So I assume either
people don't use other encodings, or JDK has support.

One page that's been useful when figuring out how
encodings are to work has been this one:

http://www.iana.org/assignments/character-sets

which is linked to from xml specification itself.

Hope this helps!

-+ Tatu +-

> Jimmy
> ----- Original Message ----- 
> From: "Tatu Saloranta" <cow...@ya...>
> To: <vtd...@li...>
> Sent: Monday, October 23, 2006 10:14 AM
> Subject: Re: [Vtd-xml-users] design question/best
> practice
> 
> 
> > --- Paul Tomsic <pt...@ya...> wrote:
> >
> >> well, by caching i mean in-memory.
> >> guess that's my question.  is it better to parse
> >> once,
> >> then store the xml as a stringBuffer or
> something?
> >
> > No, it's probably never good idea to use
> StringBuffer
> > (or builder) -- it will not have a parsed
> > representation, just a kind of serialization.
> There
> > are generally 3 steps in parsing:
> >
> > (a) Reading the data (from file, network)
> > (b) Decoding (byte->char)
> > (c) Tokenization (char[] -> events, or in case of
> > vtd-xml, int offsets + type)
> >
> > If you want to cache things in-memory, the most
> > compact presentation would be a raw byte array.
> That'd
> > get rid of (a). If you use StringBuffer (or char[]
> > etc), you get rid of (b), but most likely double
> > memory usage. Byte[] can contain utf-8 encoded
> > contents, which are generally quite compact --
> Strings
> > (buffers, builders) consists of 16-bit character.
> VTD
> > would still have to tokenize (and read through)
> the
> > whole contents, and being about twice the size of
> byte
> > representation, would possibly be slower than
> reading
> > from a byte array (or even disk, depending on i/o
> > speed).
> >
> > However; if you can afford to cache these docs in
> > memory, you can probably afford to just cache the
> > resulting VTD document object.
> > After all, it adds only about 50% overhead; but
> it's
> > fully parsed and all, and thus efficient to
> access.
> >
> > Finally, for these kinds of tasks, an actual
> native
> > XML database might make most sense. They store xml
> > content efficiently in structured (not serialized)
> > form. There are a few open source ones available
> (like
> > eXist).
> >
> > -+ Tatu +-
> >
> >
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