By default the entire event will be written out, except for any collections flagged as transient when they are added to the event.
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List myCollection = new ArrayList();
// Fill collection
event.put("MyCollection",myCollection);
event.getMetaData(myCollection).setTransient(true);
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In addition when creating an LCIO driver it is possible to specify either what collections should be written out, or which collections should not be written out.
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LCIODriver writer = new LCIODriver("mcfast.slcio");
writer.getWriter().addWriteOnly("MCParticle");
writer.getWriter().addWriteOnly("Jets");
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LCIODriver writer = new LCIODriver("mcfast2.slcio");
writer.getWriter().addIgnore("MCParticle");
writer.getWriter().addIgnore("Jets");
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