Parsing "aggregate" Xml documents

["Stottlemyer, Carl" <ca...@lmco.com>]

I have a situation similar to the following (the names have been changed
to make the poster appear as though they work on something fun)

I currently have a SAX parser that can read an xml document:
football_team.xml.  

<football_team>
...
</football_team>

I parse the football team document through the an object called
FootballTeamXmlParser.  The method is:

FootballTeamXmlParser
public FootballTeam parse(InputSource pSource);

I now have a new document called: football_league.xml that is an
aggregation of several football teams.  Note: The file structure of
football_team.xml is embedded in football_league.xml.  The file,
football_league.xml does not contain references to external files like
football_team.xml. 

<football_league>
   <commissioner>Carl Stottlemyer</commissioner>
   ...
   <football_team>Xml structure same as
football_team.xml</football_team>
   <football_team>...</football_team>
   ...
</football_league>

I would like to create a SAX parser, FootballLeagueXmlParser, that
utilizes my FootballTeamXmlParser.  I still want my
FootballTeamXmlParser to be capable of parsing standalone documents.  I
would like my FootballLeagueXmlParser to call the FootballTeamParser
whenever a <football_team> is encountered.  However, I can't find an
easy way to extract all of the content within a <football_team> as an
InputSource so that I can pass it to my FootballTeamParser.  

Can anyone offer any recommendations to get the most reuse out of my
FootballTeamXmlParser?

Thank you,

Carl Stottlemyer
Software Engineer

Re: Parsing "aggregate" Xml documents

[Joseph Kesselman <ke...@us.ibm.com>]

XML parsers aren't generally designed to extract sub-documents as such. You
can achieve this result by running a single parse on the complete document
and routing the output in appropriate directions -- eg, by having the
parser feed a SAX processor which fans out the input to other SAX
processors, or by building a single DOM and then calling routines that
process specific subtrees.

______________________________________
Joe Kesselman, IBM Next-Generation Web Technologies: XML, XSL and more.
"The world changed profoundly and unpredictably the day Tim Berners Lee
got bitten by a radioactive spider." -- Rafe Culpin, in r.m.filk


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