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Re: Icebergs - XML file metrics

• From: Stefan Zier <Stefan.Zier@s...>
• To: Robin LaFontaine <robin@m...>, xml-dev@l...
• Date: Mon, 26 Mar 2001 10:59:54 +0200

http://www-106.ibm.com/developerworks/education/xmljava/xmljava-6-4.html

I think this tool from IBM developerworks is a good basis to start from. It
collects stats about Document Nodes, Element Nodes, Entity Reference Nodes,
CDATA Sections, Text Nodes, Processing Instructions in a DOM tree.

---------------------------------------
Stefan Zier
Software Developer
Syntion AG - http://www.syntion.com
Leonrodplatz 2 - 80636 Munich/Germany
Phone +49 89 52 30 45-0
Fax +49 89 52 30 45-20

----- Original Message -----
From: Robin LaFontaine <robin@m...>
To: <xml-dev@l...>
Sent: Friday, March 23, 2001 6:41 PM
Subject: Icebergs - XML file metrics


> Can anyone help with this: Is there a way of 'profiling' an XML file
> to indicate its characteristics?
>
> We test our XML comparators on large files, but a 5Mb XML file could
> have twenty XML tags or 20,000 and it could be deeply nested or flat.
> So, are there any metrics to help in this characterization?
>
> Seems sensible to use ratios as far as possible, so that they are
> comparable for different file sizes, perhaps:
>
> 1. File size (not a ratio)
>
> 2. No. of elements / file size in kb = no. of elements/kb (or Mb perhaps?)
>
> 3. No. of attributes / no. of elements = no. of attributes/element
>
> 4. No. of text nodes / no. of elements = no. of text nodes/element
>
> 5. No. of text nodes / no. of unique text nodes = text re-use index
>
> 6. No. of attribute values / no. of unique attr. values = attribute
> value re-use index
>
> 7. (sum for each element of no. of ancestors for the element) / no.
> of elements = Average depth (iceberg factor).
>
> Last one indicates nesting depth, e.g.
> <a> <b/><b/><b/><b/></a> = (0+1+1+1+1)/5 = 0.8
>
> <a> <b><b><b><b></b></b>/<b></b> </a> = (0+1+2+3+4)/5 = 10/5 = 2
>
> <a> <b><b><b><b> <b><b><b><b> </b></b>/<b></b> </b></b>/<b></b> </a>
> = (0+1+2+3+4+5+6+7+8)/5 = 36/9 = 4
>
> Perhaps someone has already developed a different set of metrics.
>
> Robin
> -- -----------------------------------------------------------------
> Robin La Fontaine, Monsell EDM Ltd
> (XML file comparison, Engineering data exchange and management using
> XML, R&D Project Management)
> Tel: +44 1684 592 144 Fax: +44 1684 594 504
> Email: robin@m...      http://www.deltaxml.com
>
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