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Replace your definition tag with this and try again:

<?xml version="1.0" encoding="UTF-8"?>

<bpmn2:definitions

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:bpmn2="http://www.omg.org/spec/BPMN/20100524/MODEL"

xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"

xmlns:dc="http://www.omg.org/spec/DD/20100524/DC"

xmlns:di="http://www.omg.org/spec/DD/20100524/DI"

xmlns:drools="http://www.jboss.org/drools"

id="uniqueId"

xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd"

name="presentationProcessName"

targetNamespace="http://www.omg.org/bpmn20">