srv/demo.js
function tag (msg, done) {
    var clean_data = {
      source: 'demo-plugin',
      payload: msg.payload
    }

    done(null, clean_data)
  }
function tag (msg, done) {
    var clean_data = {
      source: 'demo-plugin',
      payload: msg.payload
    }

    done(null, clean_data)
  }
function tag ( msg , done ) { var clean_data = { source : 'demo-plugin' , payload : msg . payload } done ( null , clean_data ) }
Tagging just means returning a source and payload, it allows plugins that understand the data to tag it for themselves. This means inbound data does not need to be modified at source
Tagging just means returning a source and payload it allows plugins that understand the data to tag it for themselves . This means inbound data does not need to be modified at source