According to the Language Guide an associative map can be used in data 
definition https://developers.google.com/protocol-buffers/docs/proto#maps

When I try using it on Windows 7 I am getting a compiler error on the left 
angle bracket in "required map<uint32, bytes> properties = 1;"    

entity.proto file content:

message EntityBuffer {
required map<uint32, bytes> properties = 1;    
}


Command:
protoc --java_out=. entity.proto

Error
entity.proto:2:13: Expected field name.

protoc --version returns
libprotoc 2.6.1

I am a bit puzzled. 

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