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Re: [xmlblaster] XML newby question
Michael Atighetchi wrote:
The documentation in XmlKey gives this as a typical publish example:
<key oid='4711' contentMime='text/xml'>
<AGENT id='192.168.124.20' subId='1' type='generic'>
<DRIVER id='FileProof' pollingFreq='10'>
What is the common way for an application to parse this XML chunck in
the subscribing client to get out id, subId and type in <AGENT> ?
This message meta information is put into the big internal DOM tree
and is immutable for the lifetime of a topic.
You can NOT extract parts of it, you can only query on it.
Only the first (administrative) message of a topic (a specific key oid)
is used to store the key DOM.
Sending further messages with the same key oid but different
key meta informations have not effect (the key meta information
The key meta information (here AGENT and DRIVER) are only used
to describe a topic and to find it with XPath.
The message content delivers your problem domain data.
If the content contains XML syntax you can consider using
Peter Antmans XPath mime plugin to further filter
messages depending on the content (full text search), see
Where should we improve the documentation to make this clear?
(where did you expect to find this information?)
How does this relate to the implicit DOM tree that xmlblaster creates
(I say a lot of references to this in the documentation, but could not
figure out how to extract the attribute values out of the DOM).