Adding X1 Identity extensions

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

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"

           xmlns="urn:3GPP:ns:li:3GPPX1Extensions:r16:v3"

           targetNamespace="urn:3GPP:ns:li:3GPPX1Extensions:r16:v3"

           xmlns="urn:3GPP:ns:li:3GPPX1Extensions:r17:v1"

           xmlns:etsi103280="http://uri.etsi.org/03280/common/2017/07"

           targetNamespace="urn:3GPP:ns:li:3GPPX1Extensions:r17:v1"

           elementFormDefault="qualified">

<xs:import namespace="http://uri.etsi.org/03280/common/2017/07"/>

  <xs:element name="X1Extensions" type="X1Extension"></xs:element>

  <xs:complexType name="X1Extensions">

    <xs:sequence>

  </xs:simpleType>

  <xs:element name="IdentityAssociationTargetIdentifier" type="EmptyElement"></xs:element>

  <xs:element name="AKMATargetIdentifier" type="AKMATargetIdentifier"></xs:element>

  <xs:complexType name="AKMATargetIdentifier">

    <xs:choice>

      <xs:element name="AKID" type="etsi103280:NAI"></xs:element>

    </xs:choice>

  </xs:complexType>  

</xs:schema>

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