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+<?xml version="1.0"?>
+<!--
+###################################################
+##Message Sink (the source port is a message)
+###################################################
+ -->
+<block>
+ <name>Message Sink</name>
+ <key>gr_message_sink</key>
+ <import>from gnuradio import gr</import>
+ <make>gr.message_sink($type.size*$vlen, $(id)_msgq, $dont_block)</make>
+ <param>
+ <name>Input Type</name>
+ <key>type</key>
+ <type>enum</type>
+ <option>
+ <name>Complex</name>
+ <key>complex</key>
+ <opt>size:gr.sizeof_gr_complex</opt>
+ </option>
+ <option>
+ <name>Float</name>
+ <key>float</key>
+ <opt>size:gr.sizeof_float</opt>
+ </option>
+ <option>
+ <name>Int</name>
+ <key>int</key>
+ <opt>size:gr.sizeof_int</opt>
+ </option>
+ <option>
+ <name>Short</name>
+ <key>short</key>
+ <opt>size:gr.sizeof_short</opt>
+ </option>
+ <option>
+ <name>Byte</name>
+ <key>byte</key>
+ <opt>size:gr.sizeof_char</opt>
+ </option>
+ </param>
+ <param>
+ <name>Don't Block</name>
+ <key>dont_block</key>
+ <value>False</value>
+ <type>enum</type>
+ <option>
+ <name>Don't Block</name>
+ <key>True</key>
+ </option>
+ <option>
+ <name>Block</name>
+ <key>False</key>
+ </option>
+ </param>
+ <param>
+ <name>Vec Length</name>
+ <key>vlen</key>
+ <value>1</value>
+ <type>int</type>
+ </param>
+ <check>$vlen &gt; 0</check>
+ <sink>
+ <name>in</name>
+ <type>$type</type>
+ <vlen>$vlen</vlen>
+ </sink>
+ <source>
+ <name>out</name>
+ <type>msg</type>
+ </source>
+</block>