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    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:title="ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="RelatedPartyTransactionLineItems" xlink:to="ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:title="definition: RelatedPartyTransactionLineItems to ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" use="optional" order="1.0" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:to="RelatedPartyTransactionsByRelatedPartyAxis" xlink:title="definition: ScheduleOfRelatedPartyTransactionsByRelatedPartyTable to RelatedPartyTransactionsByRelatedPartyAxis" use="optional" order="1.0"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RelatedPartyTransactionLineItems" xlink:to="RelatedPartyTransactionsDisclosureAbstract" xlink:title="definition: RelatedPartyTransactionLineItems to RelatedPartyTransactionsDisclosureAbstract" order="2.0"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.paalp.com/role/DisclosureRelatedPartyTransactionsDetails4">
    <link:loc xlink:type="locator" xlink:href="paa-20110331.xsd#paa_PartnersCapitalAndDistributionLineItems" xlink:label="PartnersCapitalAndDistributionLineItems" xlink:title="PartnersCapitalAndDistributionLineItems"/>
    <link:loc xlink:type="locator" xlink:href="paa-20110331.xsd#paa_RelatedPartyTransactionsDisclosureAbstract" xlink:label="RelatedPartyTransactionsDisclosureAbstract" xlink:title="RelatedPartyTransactionsDisclosureAbstract"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="PartnersCapitalAndDistributionLineItems" xlink:to="RelatedPartyTransactionsDisclosureAbstract" xlink:title="definition: PartnersCapitalAndDistributionLineItems to RelatedPartyTransactionsDisclosureAbstract" order="1.0"/>
    <link:loc xlink:type="locator" xlink:href="paa-20110331.xsd#paa_PaymentsForPurchaseOfPrivatePlacementUnits" xlink:label="PaymentsForPurchaseOfPrivatePlacementUnits" xlink:title="PaymentsForPurchaseOfPrivatePlacementUnits"/>
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="RelatedPartyTransactionsDisclosureAbstract" xlink:to="PaymentsForPurchaseOfPrivatePlacementUnits" xlink:title="definition: RelatedPartyTransactionsDisclosureAbstract to PaymentsForPurchaseOfPrivatePlacementUnits" use="optional" order="8000.0"/>
  </link:definitionLink>
</link:linkbase>
</XBRL>
