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authorStephen D. Huston <shuston@apache.org>2011-10-20 18:42:46 +0000
committerStephen D. Huston <shuston@apache.org>2011-10-20 18:42:46 +0000
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treef24776684c025fbed6a0431bf3d6811f0a1aae7a /cpp/examples/xml-exchange/README.txt
parent718ff5b34dd1e87eb79fa4c61fec668d1dc33103 (diff)
downloadqpid-python-5eb354b338bb8d8fcd35b6ac3fb33f8103e757c3.tar.gz
Merge trunk to QPID-2519 branch
git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/QPID-2519@1186990 13f79535-47bb-0310-9956-ffa450edef68
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-This example shows how to program a simple application
-using the XML Exchange.
-
-[Note: The XML Exchange is not a standard AMQP exchange type. To run
-this example you need to have a broker that has support for the xml
-exchange. If you are compiling the broker from source please refer to
-the INSTALL notes from qpid.]
-
-To run the example, execute the programs in the
-following order:
-
-1 ./declare_queues
-2 ./listener
-3 ./message_producer (in a separate window)
-
-The XML Exchange must be explicitly declared. Bindings
-are established using queries in XQuery. These queries
-can reference message content, message application
-properties (which are declared as external variables
-in the XQuery), or both.
-
-Once this is done, message producers publish to the
-exchange using the exchange name and a routing key,
-just as for other exchange types. Message consumers
-read from the queues to which messages are routed.
-If a message does not have XML content, or is
-missing message application properties needed by
-the query, the query is not routed.
-
-Queries can use message application headers to
-provide functionality similar to JMS selectors.
-If a query does not use the content of a message,
-the message content is not parsed, and need not
-be XML.
-
-The XQuery processor, XQilla, does path-based
-document projection, so once the portion of
-a document needed to evaluate a query has
-been read, it stops parsing the document.
-Suppose a long document has a header section.
-You can indicate in the query that only
-one header section needs to be queried,
-and there is no need to parse the entire
-document to see if there are further header
-sections, using a path like this:
-
-./message/header[1]/date
-
-If you used a path like this, all children
-of the message element would be read to
-see if there are further headers:
-
-./message/header/date