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The correct format for message-type in a .msg file is
package_name/data_type_name[] variable name
Where data_type_name is a message in the package package_name
eg.
std_msgs/Float64[] values
Note that this is not a regular array in c++.
After generating the msg file, if you look at the .h file for that message, you will find that values is a vector of doubles.
std::vector <double> values;