How can we add the first event to all existing event as a matedata?

Here is the case , I have an huge XML file . In which i have extracted the events based on the tags.So i have the 3 tags header, trailer and body . So, the output will be the header section as one event and body was divide into x number of events based on the internal tag and trailer has one event . I need header section to be attached on all the events . How can we do this? Structure of the xml![alt text][1] [1]: /storage/temp/254925-vikas.png