<?xml version="1.0"?>
<PropertySetDef xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" ifdguid="bd932780d20611e1800000215ad4efdf" templatetype="PSET_TYPEDRIVENOVERRIDE" xsi:noNamespaceSchemaLocation="http://buildingSMART-tech.org/xml/psd/PSD_IFC4.xsd">
  <IfcVersion version="IFC4" />
  <Name>Pset_ServiceLife</Name>
  <Definition>Captures the period of time that an artifact will last.  HISTORY: Introduced in IFC2X4 as replacement for IfcServiceLife.</Definition>
  <Applicability />
  <ApplicableClasses>
    <ClassName>IfcElement</ClassName>
  </ApplicableClasses>
  <ApplicableTypeValue>IfcElement</ApplicableTypeValue>
  <PropertyDefs>
    <PropertyDef ifdguid="eadfd580d20611e1800000215ad4efdf">
      <Name>ServiceLifeDuration</Name>
      <Definition>The length or duration of a service life.  

The lower bound indicates pessimistic service life, the upper bound indicates optimistic service life, and the setpoint indicates the typical service life.</Definition>
      <PropertyType>
        <TypePropertyBoundedValue>
          <DataType type="IfcDuration" />
        </TypePropertyBoundedValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Service Life Duration</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
    <PropertyDef ifdguid="8eb2f46791c242e7b997996569152d4f">
      <Name>MeanTimeBetweenFailure</Name>
      <Definition>The average time duration between instances of failure of a product.</Definition>
      <PropertyType>
        <TypePropertySingleValue>
          <DataType type="IfcDuration" />
        </TypePropertySingleValue>
      </PropertyType>
      <NameAliases>
        <NameAlias lang="en">Mean Time Between Failure</NameAlias>
      </NameAliases>
      <DefinitionAliases>
        <DefinitionAlias lang="en" />
      </DefinitionAliases>
    </PropertyDef>
  </PropertyDefs>
  <PsetDefinitionAliases>
    <PsetDefinitionAlias lang="en" />
  </PsetDefinitionAliases>
</PropertySetDef>