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Re: Parsed Representation of an XML


ram menon
I'm certain that this is already being done in various products, by some
vendors that are no doubt on this listserv but cannot admit to this due
to the proprietary techniques of their products.

Kind Regards,
Joe Chiusano
Booz | Allen | Hamilton
Strategy and Technology Consultants to the World

Ram Menon wrote:
> 
> Hi All,
> 
>   At a high level, XML Processing could involve the following steps.
>    1) Read the XML file
>    2) Parse the XML to an in-memory representation
>    3) Use the Parsed Representation to extract values, format values through
> XSLT, etc, and so on.
> 
> What I wanted to know is the fact as to why do not have a parsed
> representation based on the access pattern and usage of the parsed document
> ?
> For e.g. the XSLT might use the document to retrieve three values from one
> particular subtree, or maybe process all the children at a particular depth
> within a subtree.
> 
> WHy not have another input to the parser, which is, an abstract
> representation of the access pattern, and then the in-memory document be
> optimized for that particular pattern? [i.e optimal in terms of the access
> time and memory usage].
> 
> i.e.
> XML file + Access-Metadata -------**XML Parser** -->Optimal Internal
> Representation
> 
> The DOM internal representation fundamentally is a single instance of a
> particular nature of "Packing" of the XML. This form of "Packing" may not be
> beneficial for certain use-cases. Why not think out of the box and come up
> with some different sort of packing that allows all the required nodes to be
> "close" to each other, to facilitate fast traversal, and maybe lower memory
> usage by the fact the parsing only generates a partial document which is
> just what might be required.
> For e.g. one particular sdenario might be the "inversal" of the XML
> structure, as such; [I am just choosing this ad-hoc];i.e. the "supposed to
> be" leaf nodes of the parsed tree appear as the top level elements within
> the parsed representation, and each of them have a reference [in the form of
> some attribute or something on those lines] to their parents along with
> them; very similar to viewing a n-ary tree reversed. Another form of packing
> could be a "cube" like packing, where we build a "multi-dimensional data
> structure" based on the structure of the XML content. The cube can be
> accessed from all six of its faces, which might correspond to the
> principally accessed members within the document. All these are a subset of
> the possible structures that could be generated as a result of parsing the
> XML. Each of these structures have definitive traversal patterns and costs.
> 
> This might seem a very vague idea, but would be good if somebody can build
> on it for better.
> 
> rgds,
> Ram Menon
> 
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-- 
Kind Regards,
Joseph Chiusano
Associate
Booz | Allen | Hamilton

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