Editing Stream Tags

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== Tag Propagation ==
 
== Tag Propagation ==
  
We now know how to add tags to streams, and how to read them. But what happens to tags after they were read? And what happens to tags that aren't used? After all, there are many blocks that don't care about tags at all.
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Tags are propagated downstream from block to block like the normal
 
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data streams. How tags are actually moved depends on a specific
The answer is: It depends on the ''tag propagation policy'' of a block what happens to tags that enter it.<br />
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propagation policy. We defined three types of policies:
There are [http://gnuradio.org/doc/doxygen/classgr_1_1block.html#abc40fd4d514724a5446a2b34b2352b4e three policies] to choose from:
 
  
 
# All-to-All: all tags from any input port are replicated to all output ports
 
# All-to-All: all tags from any input port are replicated to all output ports

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