diff --git a/3gppx1extensions.xsd b/3gppx1extensions.xsd
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+++ b/3gppx1extensions.xsd
@@ -0,0 +1,189 @@
+<?xml version="1.0" encoding="utf-8"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
+           xmlns="urn:3GPP:ns:li:3GPPX1Extensions"
+           targetNamespace="urn:3GPP:ns:li:3GPPX1Extensions"
+           elementFormDefault="qualified">
+
+  <xs:complexType name="X1Extensions">
+    <xs:sequence>
+      <xs:element name="Extension" type="X1Extension" minOccurs="1" maxOccurs="unbounded"></xs:element>
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="X1Extension">
+    <xs:choice>
+      <xs:element name="LALSLILCSTargetProvisioning" type="LALSLILCSTargetProvisioningExtensions"></xs:element>
+      <xs:element name="LALSLTFProvisioning" type="LALSLTFProvisioningExtensions"></xs:element>
+      <xs:element name="HeaderReporting" type="PDHRReportingExtensions"></xs:element>
+      <xs:element name="ServiceScopingOptions" type="ServiceScopingOptions"></xs:element>
+    </xs:choice>
+  </xs:complexType>
+
+  <xs:complexType name="LALSLILCSTargetProvisioningExtensions">
+    <xs:sequence>
+      <xs:element name="PositioningServiceType" type="PositioningServiceType"></xs:element>
+      <xs:element name="PositioningPeriodicity" type="PositioningPeriodicity" minOccurs="0"></xs:element>
+      <xs:element name="PositioningParameters" type="PositioningParameters" minOccurs="0"></xs:element>
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:simpleType name="PositioningServiceType">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="Immediate"></xs:enumeration>
+      <xs:enumeration value="Periodic"></xs:enumeration>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="PositioningPeriodicity">
+    <xs:restriction base="xs:nonNegativeInteger">
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="PositioningParameters">
+    <xs:sequence>
+      <xs:element name="RequestedLocationType" type="RequestedLocationType" minOccurs="0"></xs:element>
+      <xs:element name="RequestedResponseType" type="RequestedResponseType" minOccurs="0"></xs:element>
+      <xs:element name="MaxLocationAge" type="xs:nonNegativeInteger" minOccurs="0"></xs:element>
+      <xs:element name="ResponseTimingRequired" type="ResponseTimingRequired" minOccurs="0"></xs:element>
+      <xs:element name="ResponseTimer" type="xs:nonNegativeInteger" minOccurs="0"></xs:element>
+      <xs:element name="HorizontalAccuracy" type="NumberWithQOSClass" minOccurs="0"></xs:element>
+      <xs:element name="AltitudeAccuracy" type="NumberWithQOSClass" minOccurs="0"></xs:element>
+      <xs:element name="MotionStateRequest" type="EmptyElement" minOccurs="0"></xs:element>
+    </xs:sequence>
+  </xs:complexType>
+  <xs:simpleType name="RequestedLocationType">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="CURRENT"></xs:enumeration>
+      <xs:enumeration value="CURRENT_OR_LAST"></xs:enumeration>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="RequestedResponseType">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="SYNC"></xs:enumeration>
+      <xs:enumeration value="ASYNC"></xs:enumeration>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="ResponseTimingRequired">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="NO_DELAY"></xs:enumeration>
+      <xs:enumeration value="LOW_DELAY"></xs:enumeration>
+      <xs:enumeration value="DELAY_TOL"></xs:enumeration>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="NumberWithQOSClass">
+    <xs:simpleContent>
+      <xs:extension base="xs:nonNegativeInteger">
+        <xs:attribute name="qos_class" type="QOSClass"></xs:attribute>
+      </xs:extension>
+    </xs:simpleContent>
+  </xs:complexType>
+
+  <xs:simpleType name="QOSClass">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="ASSURED"></xs:enumeration>
+      <xs:enumeration value="BEST_EFFORT"></xs:enumeration>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="EmptyElement">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value=""></xs:enumeration>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="LALSLTFProvisioningExtensions">
+    <xs:sequence>
+      <xs:element name="LILCSClientAddress" type="LILCSClientIPAddress"></xs:element>
+      <xs:element name="PositioningParameters" type="PositioningParameters" minOccurs="0"></xs:element>
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="LILCSClientIPAddress">
+    <xs:sequence>
+      <xs:choice>
+        <xs:element name="IPv4Address" type="IPv4Address"/>
+        <xs:element name="IPv6Address" type="IPv6Address"/>
+      </xs:choice>
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:simpleType name="IPv4Address">
+    <xs:restriction base="xs:token">
+      <xs:pattern value="((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])"/>
+    </xs:restriction>
+  </xs:simpleType>
+  
+  <xs:simpleType name="IPv6Address">
+    <xs:restriction base="xs:token">
+      <xs:pattern value="([0-9a-f]{4}:){7}([0-9a-f]{4})"/>
+    </xs:restriction>
+  </xs:simpleType>
+  
+  <xs:complexType name="PDHRReportingExtensions">
+    <xs:sequence>
+      <xs:element name="PDHType" type="PDHType"></xs:element>
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="PDHType">
+    <xs:choice>
+      <xs:element name="PDHR" type="EmptyElement"></xs:element>
+      <xs:element name="PDSR" type="PDSRParameters"></xs:element>
+    </xs:choice>
+  </xs:complexType>
+
+  <xs:complexType name="PDSRParameters">
+    <xs:sequence>
+      <xs:element name="PDSRTriggerType" type="PDSRTriggerType"></xs:element>
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="PDSRTriggerType">
+    <xs:choice>
+      <xs:element name="TimerExpiry" type="TimerExpiryInSeconds"></xs:element>
+      <xs:element name="PacketCount" type="xs:nonNegativeInteger"></xs:element>
+      <xs:element name="ByteCount" type="xs:nonNegativeInteger"></xs:element>
+    </xs:choice>
+  </xs:complexType>
+
+  <xs:simpleType name="TimerExpiryInSeconds">
+    <xs:restriction base="xs:nonNegativeInteger">
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="ServiceScopingOptions">
+    <xs:sequence>
+      <xs:element name="ServiceTypeOptions" type="ServiceTypeOptions"></xs:element>
+      <xs:element name="LocationInformationOptions" type="LocationInformationOptions"></xs:element>
+      <xs:element name="NonHPLMNRANTrafficDelivery" type="ServiceScopeOptionValue"></xs:element>
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="ServiceTypeOptions">
+    <xs:sequence>
+      <xs:element name="Voice" type="ServiceScopeOptionValue"></xs:element>
+      <xs:element name="Data" type="ServiceScopeOptionValue"></xs:element>
+      <xs:element name="Messaging" type="ServiceScopeOptionValue"></xs:element>
+      <xs:element name="PTT" type="ServiceScopeOptionValue"></xs:element>
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="LocationInformationOptions">
+    <xs:sequence>
+      <xs:element name="ReportLocationAtBeginningAndEnd" type="ServiceScopeOptionValue"></xs:element>
+      <xs:element name="ReportLocationUpdate" type="ServiceScopeOptionValue"></xs:element>
+      <xs:element name="LALS" type="ServiceScopeOptionValue"></xs:element>
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:simpleType name="ServiceScopeOptionValue">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="Deliver"></xs:enumeration>
+      <xs:enumeration value="DoNotDeliver"></xs:enumeration>
+    </xs:restriction>
+  </xs:simpleType>
+  
+</xs:schema>