Data Model and TLV working (CON-1553)

[zedxpace]

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As we are aware that we have xml file's like matter-device.xml.
when we send any message over network it is being transmitted in form of TLV .
now the query is :
how data received over tlv is being parsed in matter on reception?
do xml file's has anything to do with parsing / de-parsing tlv? and if not then is it that only role of these xml is to generate c cpp code via zaptool.

Additional context
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[wqx6]

The xml files in connectedhomeip/src/app/zap-templates/zcl/data-model/chip defined the data model of all the clusters in Matter SPEC. And with those xml files, zaptool will generate the code of the APIs to decode/encode the attributes/command-data for those clusters in connectedhomeip/zzz_generated/app-common/app-common/zap-generated/cluster-objects.cpp. And when the device receives Matter application-layer messages, it will handle them in InteractionModelEngine::OnMessageReceived() and dispatch them to CommandResponseSender(CommandHandler), CommandSender, ReadHandler, ReadClient, WriteHandleror WriteClient which call the generated API to decode the messages.