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+<?xml version="1.0"?>
+<block>
+ <name>Message Sink</name>
+ <key>gsm_message_sink</key>
+ <import>import grgsm</import>
+ <make>grgsm.message_sink()</make>
+
+ <sink>
+ <name>in</name>
+ <type>message</type>
+ </sink>
+
+ <doc>
+This block is a message sink for testing purposes.
+
+The data can be retrieved using function get_messages()
+
+ </doc>
+</block>