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This example shows how to perform partially event-driven, partially in-
memory processing using the Embedded C++/Hybrid mapping. With partially
event-driven parsing and serialization we can process parts of the
document as they become available as well as handle documents that
are too large to fit into memory.
This example uses the parser and serializer customization mechanisms
provided by the C++/Hybrid mapping. For more information, see Section
4.8, "Customizing the Object Model" and Section 6.1, "Customizing
Parsers and Serializers" in the Embedded C++/Hybrid Mapping Getting
Started Guide.
The example consists of the following files:
position.xsd
XML Schema which describes a simple object position vocabulary.
The position is represented as a potentially large series of
latitude/longitude measurements.
position.xml
Sample object position document.
position.hxx
position.cxx
position-pskel.hxx
position-pskel.cxx
position-pimpl.hxx
position-pimpl.cxx
position-pskel.hxx
position-pskel.cxx
position-pimpl.hxx
position-pimpl.cxx
Object model (the first pair of files), parser skeletons (the
second pair), parser implementations (the third pair), serializer
skeletons (the fourth pair), and serializer implementations (the
fifth pair). These files are generated by the XSD/e compiler from
position.xsd. The --generate-parser, --generate-serializer, and
--generate-aggregate options were used to request the generation
of the parsing and serialization code. The --custom-parser option
was used to customize the object_pimpl parser implementation. The
--custom-serializer option was used to customize the object_simpl
serializer implementation.
object-pimpl.hxx
object-pimpl.cxx
Custom object parser implementation. It calculates the average
latitude and longitude values as position measurements become
available. At the end it prints the object position based on
these calculations.
object-simpl.hxx
object-simpl.cxx
Custom object serializer implementation. It performs a number of
measurements of the object position and serializes them as they
become available.
driver.cxx
Driver for the example. It first calls the parser that calculates
and prints the object position without constructing the object
model. It then serializes a new set of measurements which are
taken as serialization progresses.
To run the example on the sample XML instance document simply execute:
$ ./driver position.xml
The example reads from STDIN if input file is not specified:
$ ./driver <position.xml
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