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POProtocol specification in XML
 

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    <p>Is there a way to specify a packet-based protocol in XML, so (de)serialization can happen automatically?</p> <p>The context is as follows. I have a device that communicates through a serial port. It sends and receives a byte stream consisting of 'packets'. A packet is a collection of elementary data types and (sometimes) other packets. Some elements of packets are conditional; their inclusion depends on earlier elements.</p> <p>I have a C# application that communicates with this device. Naturally, I don't want to work on a byte-level throughout my application; I want to separate the protocol from my application code. Therefore I need to translate the byte stream to structures (classes).</p> <p>Currently I have implemented the protocol in C# by defining a class for each packet. These classes define the order and type of elements for each packet. Making class members conditional is difficult, so protocol information ends up in functions.</p> <p>I imagine XML that looks like this (note that my experience designing XML is limited):</p> <pre><code>&lt;packet&gt; &lt;field name="Author" type="int32" /&gt; &lt;field name="Nickname" type="bytes" size="4"&gt; &lt;condition type="range"&gt; &lt;field&gt;Author&lt;/field&gt; &lt;min&gt;3&lt;/min&gt; &lt;max&gt;6&lt;/min&gt; &lt;/condition&gt; &lt;/field&gt; &lt;/packet&gt; </code></pre> <p>.NET has something called a 'binary serializer', but I don't think that's what I'm looking for.</p> <p>Is there a way to separate protocol and code, even if packets 'include' other packets and have conditional elements?</p>
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    1. USMatt
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    1. COSounds a bit like WSDL.
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      1. USJason Webb
    2. COAre you defining the packet structure coming from the device ?...or is that preordained ?
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      1. USRusty
    3. COThe packet structure is preordained. I should also say that my interest is mostly academic, not practical or commercial.
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