Downgrade specification version to one supported by Neon.

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

<description:Group xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:description="http://www.eclipse.org/sirius/description/1.1.0" xmlns:description_1="http://www.eclipse.org/sirius/diagram/sequence/description/2.0.0" xmlns:description_2="http://www.eclipse.org/sirius/diagram/description/1.1.0" xmlns:style="http://www.eclipse.org/sirius/diagram/description/style/1.1.0" xmlns:tool="http://www.eclipse.org/sirius/diagram/sequence/description/tool/2.0.0" xmlns:tool_1="http://www.eclipse.org/sirius/description/tool/1.1.0" xmlns:tool_2="http://www.eclipse.org/sirius/diagram/description/tool/1.1.0" name="TDL" version="12.0.0.2017041100">

<description:Group xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:description="http://www.eclipse.org/sirius/description/1.1.0" xmlns:description_1="http://www.eclipse.org/sirius/diagram/sequence/description/2.0.0" xmlns:description_2="http://www.eclipse.org/sirius/diagram/description/1.1.0" xmlns:style="http://www.eclipse.org/sirius/diagram/description/style/1.1.0" xmlns:tool="http://www.eclipse.org/sirius/diagram/sequence/description/tool/2.0.0" xmlns:tool_1="http://www.eclipse.org/sirius/description/tool/1.1.0" xmlns:tool_2="http://www.eclipse.org/sirius/diagram/description/tool/1.1.0" name="TDL" version="11.1.1.201610211630">

  <ownedViewpoints name="org.etsi.mts.tdl" label="TDL">

    <ownedRepresentations xsi:type="description_1:SequenceDiagramDescription" name="TestDescriptionDiagram" label="TDL Behavior" domainClass="tdl.TestDescription" enablePopupBars="true" endsOrdering="[getOccurrences()->select(e|eventEnds->includes(e))/]" instanceRolesOrdering="[testConfiguration.connection.endPoint->sortedBy(ref|ref.component.name + '.' + ref.gate.name)/]">

      <metamodel href="../../org.etsi.mts.tdl.model/model/tdl.ecore#/"/>