From: Robert Klemme <shortcutter@...>
Date: 2008-04-01T15:48:00+09:00
Subject: Re: rexml to slow

2008/3/31, Bu Mihai <mihai.bulhac@yahoo.com>:
> Robert Klemme wrote:
>  > 2008/3/31, Marc Heiler <shevegen@linuxmail.org>:
>  >> I believe the core problem is that XML itself is pretty sub-optimal for
>  >>  almost everything ;)
>  >
>  > As always, there are problems where this tool (XML) is suited good,
>  > less good and not at all.
>  >
>  >>  Is anyone updating the REXML website by the way? I believe it would be
>  >>  interesting to see exactly these kind of speed issues handled on the
>  >>  website because if i am not mistaken, these questions and problems
>  >>  continually pop-up with *XML
>  >
>  > Not sure whether I agree: IMHO in this case the problem is a
>  > misapplication of XML.  XML is good for persisting structured data but
>  > not as an in memory model for calculations.
>
> What is IMHO?

http://www.google.com/search?q=imho
http://dictionary.reference.com/search?q=imho

>; i'm a newbie in ruby and at first i was searching
>  something similary with C++ tree structure (beacause that i would use if
>  is was C) but i want in ruby and i was searching some gem to help me
>  because i have to learn more about ruby language to build my own ruby
>  class to work with.

I believe it works better the other way round: understand a concept
(such as "tree", which is not too difficult) and implement it in Ruby.

http://raa.ruby-lang.org/search.rhtml?search=tree

Apart from that, it's easy to roll your own:

TreeNode = Struct.new :data, :parent, :children do
  def initialize(data = nil, parent = nil)
    self.data = data
    self.parent = parent
    self.children = []
  end
end

>  I've tried xml beacuse it was the best (!?)  i found in ruby for
>  implementing a tree structure (not only a binary tree), but it is slowly
>  when i want to read a big structure.

900 lines XML is far from a "big structure".  And XML is format for
/persistently/ storing structured data - mostly in files.  An XML DOM
is nothing you want to do complex non XML operations on. because of
the overhead.

Kind regards

robert

-- 
use.inject do |as, often| as.you_can - without end