diff --git a/sdkmanager/libs/sdklib/src/com/android/sdklib/repository/sdk-repository-8.xsd b/sdkmanager/libs/sdklib/src/com/android/sdklib/repository/sdk-repository-8.xsd
new file mode 100755
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+++ b/sdkmanager/libs/sdklib/src/com/android/sdklib/repository/sdk-repository-8.xsd
@@ -0,0 +1,652 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+-->
+<xsd:schema
+    targetNamespace="http://schemas.android.com/sdk/android/repository/8"
+    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
+    xmlns:sdk="http://schemas.android.com/sdk/android/repository/8"
+    elementFormDefault="qualified"
+    attributeFormDefault="unqualified"
+    version="1">
+
+    <!-- The repository contains a collection of downloadable items known as
+         "packages". Each package has a type and various attributes and contains
+         a list of file "archives" that can be downloaded for specific OSes.
+
+         An Android SDK repository is a web site that contains a "repository.xml"
+         file that conforms to this XML Schema.
+
+         History:
+         - v1 is used by the SDK Updater in Tools r3 and r4.
+
+         - v2 is used by the SDK Updater in Tools r5:
+            - It introduces a new <sample> repository type. Previously samples
+              were included in the <platform> packages. Instead this package is used
+              and and the samples are installed in $SDK/samples.
+            - All repository types have a new <obsolete> node. It works as a marker
+              to indicate the package is obsolete and should not be selected by default.
+              The UI also hides these out by default.
+
+         - v3 is used by the SDK Updater in Tools r8:
+            - It introduces a new <platform-tool> repository type. Previously platform-specific
+              tools were included in the <platform> packages. Instead this package is used
+              and platform-specific tools are installed in $SDK/platform-tools
+            - There's a new element <min-platform-tools-rev> in <tool>. The tool package now
+              requires that at least some minimal version of <platform-tool> be installed.
+            - It removes the <addon> repository type, which is now in its own XML Schema.
+
+         - v4 is used by the SDK Updater in Tools r12:
+            - <extra> element now has a <project-files> element that contains 1 or
+              or more <path>, each indicating the relative path of a file that this package
+              can contribute to installed projects.
+            - <platform> element now has a mandatory <layoutlib> that indicates the API
+              and revision of that layout library for this particular platform.
+
+         - v5 is used by the SDK Manager in Tools r14:
+            - <extra> now has an <old-paths> element, a ;-separated list of old paths that
+              should be detected and migrated to the new <path> for that package.
+            - <platform> has a new optional <abi-included> that describes the ABI of the
+              system image included in the platform, if any.
+            - New <system-image> package type, to store system images outside of <platform>s.
+            - New <source> package type.
+
+         - v6 is used by the SDK Manager in Tools r18:
+            - <extra> packages are removed. They are served only by the addon XML.
+            - <platform>, <system-image>, <source>, <tool>, <platform-tool>, <doc>
+              and <sample> get a new optional field <beta-rc> which can be used to indicate
+              the package is a Beta Release Candidate and not a final release.
+
+         - v7 is used by the SDK Manager in Tools r20:
+            - For <tool> and <platform-tool> packages, the <revision> element becomes a
+              a "full revision" element with <major>, <minor>, <micro> and <preview> sub-elements.
+            - The <beta-rc> element is no longer supported, it is replaced by
+              <revision> -> <preview> and is only for <tool> and <platform-tool> packages.
+            - <min-tools-rev> and <min-platform-tools-rev> also become a full revision element.
+
+         - v8 is used by the SDK Manager in Tools r22:
+            - It introduces the new <build-tool> repository type, which contains build-specific
+              tools that were before placed in either <tool> or <platform-tool> (e.g. ant,
+              aapt, aidl, etc.)
+            - <tool> has a new "min-build-tool" attribute.
+    -->
+
+    <xsd:element name="sdk-repository" type="sdk:repositoryType" />
+
+    <xsd:complexType name="repositoryType">
+        <xsd:annotation>
+            <xsd:documentation>
+                The repository contains a collection of downloadable packages.
+            </xsd:documentation>
+        </xsd:annotation>
+        <xsd:choice minOccurs="0" maxOccurs="unbounded">
+            <xsd:element name="platform"        type="sdk:platformType"     />
+            <xsd:element name="system-image"    type="sdk:systemImageType"  />
+            <xsd:element name="source"          type="sdk:sourceType"       />
+            <xsd:element name="tool"            type="sdk:toolType"         />
+            <xsd:element name="platform-tool"   type="sdk:platformToolType" />
+            <xsd:element name="build-tool"      type="sdk:buildToolType"    />
+            <xsd:element name="doc"             type="sdk:docType"          />
+            <xsd:element name="sample"          type="sdk:sampleType"       />
+            <xsd:element name="license"         type="sdk:licenseType"      />
+        </xsd:choice>
+    </xsd:complexType>
+
+    <!-- The definition of an SDK platform package. -->
+
+    <xsd:complexType name="platformType">
+        <xsd:annotation>
+            <xsd:documentation>An SDK platform package.</xsd:documentation>
+        </xsd:annotation>
+        <xsd:all>
+            <!-- The Android platform version. It is string such as "1.0". -->
+            <xsd:element name="version"   type="xsd:normalizedString" />
+            <!-- The Android API Level for the platform. An int > 0. -->
+            <xsd:element name="api-level" type="xsd:positiveInteger"  />
+            <!-- The optional codename for this platform, if it's a preview. -->
+            <xsd:element name="codename"  type="xsd:string" minOccurs="0" />
+            <!-- The revision, an int > 0, incremented each time a new
+                 package is generated. -->
+            <xsd:element name="revision"  type="xsd:positiveInteger" />
+
+            <!-- Information on the layoutlib packaged in this platform. -->
+            <xsd:element name="layoutlib" type="sdk:layoutlibType" />
+
+            <!-- optional elements -->
+
+            <!-- The optional license of this package. If present, users will have
+                 to agree to it before downloading. -->
+            <xsd:element name="uses-license"  type="sdk:usesLicenseType" minOccurs="0" />
+            <!-- The optional description of this package. -->
+            <xsd:element name="description"   type="xsd:string"      minOccurs="0" />
+            <!-- The optional description URL of this package -->
+            <xsd:element name="desc-url"      type="xsd:token"       minOccurs="0" />
+            <!-- The optional release note for this package. -->
+            <xsd:element name="release-note"  type="xsd:string"      minOccurs="0" />
+            <!-- The optional release note URL of this package -->
+            <xsd:element name="release-url"   type="xsd:token"       minOccurs="0" />
+            <!-- A list of file archives for this package. -->
+            <xsd:element name="archives"      type="sdk:archivesType" />
+            <!-- The minimal revision of tools required by this package.
+                 Optional. If present, must be a revision element. -->
+            <xsd:element name="min-tools-rev" type="sdk:revisionType" minOccurs="0" />
+
+            <!-- The ABI of the system image *included* in this platform, if any.
+                 When the field is present, it means the platform already embeds one
+                 system image. A platform can also have any number of external
+                 &lt;system-image&gt; associated with it.  -->
+            <xsd:element name="included-abi"  type="sdk:abiType" minOccurs="0" />
+
+            <!-- An optional element indicating the package is obsolete.
+                 The string content is however currently not defined and ignored. -->
+            <xsd:element name="obsolete"      type="xsd:string" minOccurs="0" />
+        </xsd:all>
+    </xsd:complexType>
+
+
+    <!-- The definition of a layout library used by a platform. -->
+
+    <xsd:complexType name="layoutlibType" >
+        <xsd:annotation>
+            <xsd:documentation>
+                Version information for a layoutlib included in a platform.
+            </xsd:documentation>
+        </xsd:annotation>
+        <xsd:all>
+            <!-- The layoutlib API level, an int > 0,
+                 incremented with each new incompatible lib. -->
+            <xsd:element name="api"          type="xsd:positiveInteger" />
+            <!-- The incremental minor revision for that API, e.g. in case of bug fixes.
+                 Optional. An int >= 0, assumed to be 0 if the element is missing. -->
+            <xsd:element name="revision"     type="xsd:nonNegativeInteger" minOccurs="0" />
+        </xsd:all>
+    </xsd:complexType>
+
+
+    <!-- The definition of a system image used by a platform. -->
+
+    <xsd:complexType name="systemImageType" >
+        <xsd:annotation>
+            <xsd:documentation>
+                System Image for a platform.
+            </xsd:documentation>
+        </xsd:annotation>
+        <xsd:all>
+            <!-- api-level + codename identifies the platform to which this system image belongs. -->
+
+            <!-- The Android API Level for the platform. An int > 0. -->
+            <xsd:element name="api-level" type="xsd:positiveInteger"  />
+            <!-- The optional codename for this platform, if it's a preview. -->
+            <xsd:element name="codename"  type="xsd:string" minOccurs="0" />
+
+            <!-- The revision, an int > 0, incremented each time a new
+                 package is generated. -->
+            <xsd:element name="revision"  type="xsd:positiveInteger" />
+
+            <!-- The ABI of the system emulated by this image. -->
+            <xsd:element name="abi"       type="sdk:abiType" />
+
+            <!-- The optional license of this package. If present, users will have
+                 to agree to it before downloading. -->
+            <xsd:element name="uses-license"  type="sdk:usesLicenseType" minOccurs="0" />
+            <!-- The optional description of this package. -->
+            <xsd:element name="description"   type="xsd:string"      minOccurs="0" />
+            <!-- The optional description URL of this package -->
+            <xsd:element name="desc-url"      type="xsd:token"       minOccurs="0" />
+            <!-- The optional release note for this package. -->
+            <xsd:element name="release-note"  type="xsd:string"      minOccurs="0" />
+            <!-- The optional release note URL of this package -->
+            <xsd:element name="release-url"   type="xsd:token"       minOccurs="0" />
+
+            <!-- A list of file archives for this package. -->
+            <xsd:element name="archives"  type="sdk:archivesType" />
+
+            <!-- An optional element indicating the package is obsolete.
+                 The string content is however currently not defined and ignored. -->
+            <xsd:element name="obsolete"  type="xsd:string" minOccurs="0" />
+        </xsd:all>
+    </xsd:complexType>
+
+
+    <!-- The definition of the ABI supported by a platform's system image. -->
+
+    <xsd:simpleType name="abiType">
+        <xsd:annotation>
+            <xsd:documentation>The ABI of a platform's system image.</xsd:documentation>
+        </xsd:annotation>
+        <xsd:restriction base="xsd:token">
+            <xsd:enumeration value="armeabi"     />
+            <xsd:enumeration value="armeabi-v7a" />
+            <xsd:enumeration value="x86"         />
+            <xsd:enumeration value="mips"        />
+        </xsd:restriction>
+    </xsd:simpleType>
+
+
+    <!-- The definition of a source package. -->
+
+    <xsd:complexType name="sourceType" >
+        <xsd:annotation>
+            <xsd:documentation>
+                Sources for a platform.
+            </xsd:documentation>
+        </xsd:annotation>
+        <xsd:all>
+            <!-- api-level + codename identifies the platform to which this source belongs. -->
+
+            <!-- The Android API Level for the platform. An int > 0. -->
+            <xsd:element name="api-level" type="xsd:positiveInteger"  />
+            <!-- The optional codename for this platform, if it's a preview. -->
+            <xsd:element name="codename"  type="xsd:string" minOccurs="0" />
+
+            <!-- The revision, an int > 0, incremented each time a new
+                 package is generated. -->
+            <xsd:element name="revision"  type="xsd:positiveInteger" />
+
+            <!-- The optional license of this package. If present, users will have
+                 to agree to it before downloading. -->
+            <xsd:element name="uses-license"  type="sdk:usesLicenseType" minOccurs="0" />
+            <!-- The optional description of this package. -->
+            <xsd:element name="description"   type="xsd:string"      minOccurs="0" />
+            <!-- The optional description URL of this package -->
+            <xsd:element name="desc-url"      type="xsd:token"       minOccurs="0" />
+            <!-- The optional release note for this package. -->
+            <xsd:element name="release-note"  type="xsd:string"      minOccurs="0" />
+            <!-- The optional release note URL of this package -->
+            <xsd:element name="release-url"   type="xsd:token"       minOccurs="0" />
+
+            <!-- A list of file archives for this package. -->
+            <xsd:element name="archives"  type="sdk:archivesType" />
+
+            <!-- An optional element indicating the package is obsolete.
+                 The string content is however currently not defined and ignored. -->
+            <xsd:element name="obsolete"  type="xsd:string" minOccurs="0" />
+        </xsd:all>
+    </xsd:complexType>
+
+
+    <!-- The definition of an SDK tool package. -->
+
+    <xsd:complexType name="toolType" >
+        <xsd:annotation>
+            <xsd:documentation>An SDK tool package.</xsd:documentation>
+        </xsd:annotation>
+        <xsd:all>
+            <!-- The full revision (major.minor.micro.preview), incremented each
+                 time a new package is generated. -->
+            <xsd:element name="revision"      type="sdk:revisionType" />
+
+            <!-- The optional license of this package. If present, users will have
+                 to agree to it before downloading. -->
+            <xsd:element name="uses-license" type="sdk:usesLicenseType" minOccurs="0" />
+            <!-- The optional description of this package. -->
+            <xsd:element name="description"  type="xsd:string"      minOccurs="0" />
+            <!-- The optional description URL of this package -->
+            <xsd:element name="desc-url"     type="xsd:token"       minOccurs="0" />
+            <!-- The optional release note for this package. -->
+            <xsd:element name="release-note" type="xsd:string"      minOccurs="0" />
+            <!-- The optional release note URL of this package -->
+            <xsd:element name="release-url"  type="xsd:token"       minOccurs="0" />
+            <!-- A list of file archives for this package. -->
+            <xsd:element name="archives"     type="sdk:archivesType" />
+
+            <!-- The minimal revision of platform-tools required by this package.
+                 Mandatory. Must be a revision element. -->
+            <xsd:element name="min-platform-tools-rev" type="sdk:revisionType" />
+
+            <!-- An optional element indicating the package is obsolete.
+                 The string content is however currently not defined and ignored. -->
+            <xsd:element name="obsolete"  type="xsd:string" minOccurs="0" />
+        </xsd:all>
+    </xsd:complexType>
+
+
+    <!-- The definition of an SDK platform-tool package. -->
+
+    <xsd:complexType name="platformToolType" >
+        <xsd:annotation>
+            <xsd:documentation>An SDK platform-tool package.</xsd:documentation>
+        </xsd:annotation>
+        <xsd:all>
+            <!-- The full revision (major.minor.micro.preview), incremented each
+                 time a new package is generated. -->
+            <xsd:element name="revision"      type="sdk:revisionType" />
+
+            <!-- The optional license of this package. If present, users will have
+                 to agree to it before downloading. -->
+            <xsd:element name="uses-license" type="sdk:usesLicenseType" minOccurs="0" />
+            <!-- The optional description of this package. -->
+            <xsd:element name="description"  type="xsd:string"      minOccurs="0" />
+            <!-- The optional description URL of this package -->
+            <xsd:element name="desc-url"     type="xsd:token"       minOccurs="0" />
+            <!-- The optional release note for this package. -->
+            <xsd:element name="release-note" type="xsd:string"      minOccurs="0" />
+            <!-- The optional release note URL of this package -->
+            <xsd:element name="release-url"  type="xsd:token"       minOccurs="0" />
+            <!-- A list of file archives for this package. -->
+            <xsd:element name="archives"     type="sdk:archivesType" />
+
+            <!-- An optional element indicating the package is obsolete.
+                 The string content is however currently not defined and ignored. -->
+            <xsd:element name="obsolete"  type="xsd:string" minOccurs="0" />
+        </xsd:all>
+    </xsd:complexType>
+
+    <!-- The definition of an SDK build-tool package. -->
+
+    <xsd:complexType name="buildToolType">
+        <xsd:annotation>
+            <xsd:documentation>An SDK build-tool package.</xsd:documentation>
+        </xsd:annotation>
+        <xsd:all>
+            <!-- The full revision (major.minor.micro.preview), incremented each
+                 time a new package is generated. -->
+            <xsd:element name="revision"      type="sdk:revisionType" />
+
+            <!-- optional elements -->
+
+            <!-- The optional license of this package. If present, users will have
+                 to agree to it before downloading. -->
+            <xsd:element name="uses-license"  type="sdk:usesLicenseType" minOccurs="0" />
+            <!-- The optional description of this package. -->
+            <xsd:element name="description"   type="xsd:string"      minOccurs="0" />
+            <!-- The optional description URL of this package -->
+            <xsd:element name="desc-url"      type="xsd:token"       minOccurs="0" />
+            <!-- The optional release note for this package. -->
+            <xsd:element name="release-note"  type="xsd:string"      minOccurs="0" />
+            <!-- The optional release note URL of this package -->
+            <xsd:element name="release-url"   type="xsd:token"       minOccurs="0" />
+            <!-- A list of file archives for this package. -->
+            <xsd:element name="archives"      type="sdk:archivesType" />
+
+            <!-- An optional element indicating the package is obsolete.
+                 The string content is however currently not defined and ignored. -->
+            <xsd:element name="obsolete"      type="xsd:string" minOccurs="0" />
+        </xsd:all>
+    </xsd:complexType>
+
+
+    <!-- The definition of an SDK doc package. -->
+
+    <xsd:complexType name="docType" >
+        <xsd:annotation>
+            <xsd:documentation>An SDK doc package.</xsd:documentation>
+        </xsd:annotation>
+        <xsd:all>
+            <!-- The Android API Level for the documentation. An int > 0. -->
+            <xsd:element name="api-level" type="xsd:positiveInteger"  />
+            <!-- The optional codename for this doc, if it's a preview. -->
+            <xsd:element name="codename"  type="xsd:string" minOccurs="0" />
+
+            <!-- The revision, an int > 0, incremented each time a new
+                 package is generated. -->
+            <xsd:element name="revision"     type="xsd:positiveInteger" />
+            <!-- The optional license of this package. If present, users will have
+                 to agree to it before downloading. -->
+            <xsd:element name="uses-license" type="sdk:usesLicenseType" minOccurs="0" />
+            <!-- The optional description of this package. -->
+            <xsd:element name="description"  type="xsd:string"      minOccurs="0" />
+            <!-- The optional description URL of this package -->
+            <xsd:element name="desc-url"     type="xsd:token"       minOccurs="0" />
+            <!-- The optional release note for this package. -->
+            <xsd:element name="release-note" type="xsd:string"      minOccurs="0" />
+            <!-- The optional release note URL of this package -->
+            <xsd:element name="release-url"  type="xsd:token"       minOccurs="0" />
+            <!-- A list of file archives for this package. -->
+            <xsd:element name="archives"     type="sdk:archivesType" />
+
+
+            <!-- An optional element indicating the package is obsolete.
+                 The string content is however currently not defined and ignored. -->
+            <xsd:element name="obsolete"  type="xsd:string" minOccurs="0" />
+        </xsd:all>
+    </xsd:complexType>
+
+
+    <!-- The definition of an SDK sample package. -->
+
+    <xsd:complexType name="sampleType" >
+        <xsd:annotation>
+            <xsd:documentation>An SDK sample package.</xsd:documentation>
+        </xsd:annotation>
+        <xsd:all>
+            <!-- The Android API Level for the documentation. An int > 0. -->
+            <xsd:element name="api-level" type="xsd:positiveInteger"  />
+            <!-- The optional codename for this doc, if it's a preview. -->
+            <xsd:element name="codename"  type="xsd:string" minOccurs="0" />
+
+            <!-- The revision, an int > 0, incremented each time a new
+                 package is generated. -->
+            <xsd:element name="revision"     type="xsd:positiveInteger" />
+            <!-- The optional license of this package. If present, users will have
+                 to agree to it before downloading. -->
+            <xsd:element name="uses-license" type="sdk:usesLicenseType" minOccurs="0" />
+            <!-- The optional description of this package. -->
+            <xsd:element name="description"  type="xsd:string"      minOccurs="0" />
+            <!-- The optional description URL of this package -->
+            <xsd:element name="desc-url"     type="xsd:token"       minOccurs="0" />
+            <!-- The optional release note for this package. -->
+            <xsd:element name="release-note" type="xsd:string"      minOccurs="0" />
+            <!-- The optional release note URL of this package -->
+            <xsd:element name="release-url"  type="xsd:token"       minOccurs="0" />
+            <!-- A list of file archives for this package. -->
+            <xsd:element name="archives"     type="sdk:archivesType" />
+            <!-- The minimal revision of tools required by this package.
+                 Optional. If present, must be a revision element. -->
+            <xsd:element name="min-tools-rev" type="sdk:revisionType" minOccurs="0" />
+
+
+            <!-- An optional element indicating the package is obsolete.
+                 The string content is however currently not defined and ignored. -->
+            <xsd:element name="obsolete"  type="xsd:string" minOccurs="0" />
+        </xsd:all>
+    </xsd:complexType>
+
+
+    <!-- The definition of a path segment used by the extra element. -->
+
+    <xsd:simpleType name="segmentType">
+        <xsd:annotation>
+            <xsd:documentation>
+                One path segment for the install path of an extra element.
+                It must be a single-segment path.
+            </xsd:documentation>
+        </xsd:annotation>
+        <xsd:restriction base="xsd:token">
+            <xsd:pattern value="[a-zA-Z0-9_]+"/>
+        </xsd:restriction>
+    </xsd:simpleType>
+
+    <xsd:simpleType name="segmentListType">
+        <xsd:annotation>
+            <xsd:documentation>
+                A semi-colon separated list of a segmentTypes.
+            </xsd:documentation>
+        </xsd:annotation>
+        <xsd:restriction base="xsd:token">
+            <xsd:pattern value="[a-zA-Z0-9_;]+"/>
+        </xsd:restriction>
+    </xsd:simpleType>
+
+
+    <!-- The definition of a license to be referenced by the uses-license element. -->
+
+    <xsd:complexType name="licenseType">
+        <xsd:annotation>
+            <xsd:documentation>
+                A license definition. Such a license must be used later as a reference
+                using a uses-license element in one of the package elements.
+            </xsd:documentation>
+        </xsd:annotation>
+        <xsd:simpleContent>
+            <xsd:extension base="xsd:string">
+                <xsd:attribute name="id"   type="xsd:ID" />
+                <xsd:attribute name="type" type="xsd:token" fixed="text" />
+            </xsd:extension>
+        </xsd:simpleContent>
+    </xsd:complexType>
+
+
+    <!-- Type describing the license used by a package.
+         The license MUST be defined using a license node and referenced
+         using the ref attribute of the license element inside a package.
+     -->
+
+    <xsd:complexType name="usesLicenseType">
+        <xsd:annotation>
+            <xsd:documentation>
+                Describes the license used by a package. The license MUST be defined
+                using a license node and referenced using the ref attribute of the
+                license element inside a package.
+            </xsd:documentation>
+        </xsd:annotation>
+        <xsd:attribute name="ref" type="xsd:IDREF" />
+    </xsd:complexType>
+
+
+    <!-- A collection of files that can be downloaded for a given architecture.
+         The <archives> node is mandatory in the repository elements and the
+         collection must have at least one <archive> declared.
+         Each archive is a zip file that will be unzipped in a location that depends
+         on its package type.
+     -->
+
+    <xsd:complexType name="archivesType">
+        <xsd:annotation>
+            <xsd:documentation>
+                A collection of files that can be downloaded for a given architecture.
+                The &lt;archives&gt; node is mandatory in the repository packages and the
+                collection must have at least one &lt;archive&gt; declared.
+                Each archive is a zip file that will be unzipped in a location that depends
+                on its package type.
+            </xsd:documentation>
+        </xsd:annotation>
+        <xsd:sequence minOccurs="1" maxOccurs="unbounded">
+            <!-- One archive file -->
+            <xsd:element name="archive">
+                <xsd:complexType>
+                    <!-- Properties of the archive file -->
+                    <xsd:all>
+                        <!-- The size in bytes of the archive to download. -->
+                        <xsd:element name="size"     type="xsd:positiveInteger" />
+                        <!-- The checksum of the archive file. -->
+                        <xsd:element name="checksum" type="sdk:checksumType" />
+                        <!-- The URL is an absolute URL if it starts with http://, https://
+                             or ftp://. Otherwise it is relative to the parent directory that
+                             contains this repository.xml -->
+                        <xsd:element name="url"      type="xsd:token" />
+                    </xsd:all>
+
+                    <!-- Attributes that identify the OS and architecture -->
+                    <xsd:attribute name="os" use="required">
+                        <xsd:simpleType>
+                            <xsd:restriction base="xsd:token">
+                                <xsd:enumeration value="any" />
+                                <xsd:enumeration value="linux" />
+                                <xsd:enumeration value="macosx" />
+                                <xsd:enumeration value="windows" />
+                            </xsd:restriction>
+                        </xsd:simpleType>
+                    </xsd:attribute>
+                    <xsd:attribute name="arch" use="optional">
+                        <xsd:simpleType>
+                            <xsd:restriction base="xsd:token">
+                                <xsd:enumeration value="any" />
+                                <xsd:enumeration value="ppc" />
+                                <xsd:enumeration value="x86" />
+                                <xsd:enumeration value="x86_64" />
+                            </xsd:restriction>
+                        </xsd:simpleType>
+                    </xsd:attribute>
+                </xsd:complexType>
+            </xsd:element>
+        </xsd:sequence>
+    </xsd:complexType>
+
+
+    <!-- A full revision, with a major.minor.micro and an optional preview number.
+         The major number is mandatory, the other elements are optional.
+     -->
+
+    <xsd:complexType name="revisionType">
+        <xsd:annotation>
+            <xsd:documentation>
+                A full revision, with a major.minor.micro and an
+                optional preview number. The major number is mandatory.
+            </xsd:documentation>
+        </xsd:annotation>
+        <xsd:all>
+            <!-- The major revision, an int > 0, incremented each time a new
+                 package is generated. -->
+            <xsd:element name="major"      type="xsd:positiveInteger" />
+            <!-- The minor revision, an int >= 0, incremented each time a new
+                 minor package is generated. Assumed to be 0 if missing. -->
+            <xsd:element name="minor"     type="xsd:nonNegativeInteger" minOccurs="0" />
+            <!-- The micro revision, an int >= 0, incremented each time a new
+                 buf fix is generated. Assumed to be 0 if missing. -->
+            <xsd:element name="micro"     type="xsd:nonNegativeInteger" minOccurs="0" />
+            <!-- The preview/release candidate revision, an int > 0,
+                 incremented each time a new preview is generated.
+                 Not present for final releases. -->
+            <xsd:element name="preview"   type="xsd:positiveInteger" minOccurs="0" />
+        </xsd:all>
+    </xsd:complexType>
+
+
+    <!-- A collection of file paths available in an &lt;extra&gt; package
+         that can be installed in an Android project.
+         If present, the &lt;project-files&gt; collection must contain at least one path.
+         Each path is relative to the root directory of the package.
+     -->
+
+    <xsd:complexType name="projectFilesType">
+        <xsd:annotation>
+            <xsd:documentation>
+                A collection of file paths available in an &lt;extra&gt; package
+                that can be installed in an Android project.
+                If present, the &lt;project-files&gt; collection must contain at least one path.
+                Each path is relative to the root directory of the package.
+            </xsd:documentation>
+        </xsd:annotation>
+        <xsd:sequence minOccurs="1" maxOccurs="unbounded">
+            <!-- One JAR Path, relative to the root folder of the package. -->
+            <xsd:element name="path" type="xsd:string" />
+        </xsd:sequence>
+    </xsd:complexType>
+
+
+    <!-- The definition of a file checksum -->
+
+    <xsd:simpleType name="sha1Number">
+        <xsd:annotation>
+            <xsd:documentation>A SHA1 checksum.</xsd:documentation>
+        </xsd:annotation>
+        <xsd:restriction base="xsd:string">
+            <xsd:pattern value="([0-9a-fA-F]){40}"/>
+        </xsd:restriction>
+    </xsd:simpleType>
+
+    <xsd:complexType name="checksumType">
+        <xsd:annotation>
+            <xsd:documentation>A file checksum, currently only SHA1.</xsd:documentation>
+        </xsd:annotation>
+        <xsd:simpleContent>
+            <xsd:extension base="sdk:sha1Number">
+                <xsd:attribute name="type" type="xsd:token" fixed="sha1" />
+            </xsd:extension>
+        </xsd:simpleContent>
+    </xsd:complexType>
+
+</xsd:schema>