DOM parsing vs serialization

[Chad Berkley]

On a slightly related aside, I was looking stuff up in the XPathAPI the
other day and I came across another class called CachedXPathAPI that
basically does the same thing, but it doesn't use static methods so it
doesn't have to load the document every time you run xpath.  It's
supposed to be faster according to the documentation but it does have a
warning about it not updating the cached document unless you
reinstantiate the class.

See the docs here: 
http://xml.apache.org/xalan-j/apidocs/org/apache/xpath/CachedXPathAPI.html

I started using it in the stuff that I was working on and it does seem
faster.  I think you just have to be careful if you update the document
then do another xpath query.

If you already were enlightened or astute enough to know about this
class, ignore this email :).

chad

On Fri, 2003-02-28 at 15:36, Dan Higgins wrote:
> Hi All,
> 
>     I did some simple comparisons of the time required to read a 
> serialized DOM tree (XERCESJ parser) versus the time to create the DOM 
> by parsing the XML text document. For very small docs, the times were 
> about the same. However, for XML text docs of ~5K or large,  parsing the 
> XML is 3-4 or more times faster than reading a serialized version of the 
> DOM from disk !!! (Also, the serialized file is 3-4 times bigger than 
> the original XML text.)
> 
>     It thus looks like my idea of storing eml docs in serialized form on 
> disk for morpho is NOT a good one.(Caching the DOM in RAM does help 
> performance, however.)
> 
> Dan
> 
> -- 
> *******************************************************************
> Dan Higgins                                  higgins at nceas.ucsb.edu
> http://www.nceas.ucsb.edu/    Ph: 805-892-2531
> National Center for Ecological Analysis and Synthesis (NCEAS) 
> 735 State Street - Room 205
> Santa Barbara, CA 93195
> *******************************************************************
> 
> 
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-- 
-----------------------
Chad Berkley
National Center for 
Ecological Analysis 
and Synthesis (NCEAS)
berkley at nceas.ucsb.edu
-----------------------