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+repo Manifest Format
+====================
+
+A repo manifest describes the structure of a repo client; that is
+the directories that are visible and where they should be obtained
+from with git.
+
+The basic structure of a manifest is a bare Git repository holding
+a single 'default.xml' XML file in the top level directory.
+
+Manifests are inherently version controlled, since they are kept
+within a Git repository.  Updates to manifests are automatically
+obtained by clients during `repo sync`.
+
+
+XML File Format
+---------------
+
+A manifest XML file (e.g. 'default.xml') roughly conforms to the
+following DTD:
+
+  <!DOCTYPE manifest [
+    <!ELEMENT manifest (notice?,
+                        remote*,
+                        default?,
+                        manifest-server?,
+                        remove-project*,
+                        project*)>
+  
+    <!ELEMENT notice (#PCDATA)>
+  
+    <!ELEMENT remote (EMPTY)>
+    <!ATTLIST remote name         ID    #REQUIRED>
+    <!ATTLIST remote fetch        CDATA #REQUIRED>
+    <!ATTLIST remote review       CDATA #IMPLIED>
+  
+    <!ELEMENT default (EMPTY)>
+    <!ATTLIST default remote   IDREF #IMPLIED>
+    <!ATTLIST default revision CDATA #IMPLIED>
+  
+    <!ELEMENT manifest-server (EMPTY)>
+    <!ATTLIST url              CDATA #REQUIRED>
+  
+    <!ELEMENT project (EMPTY)>
+    <!ATTLIST project name     CDATA #REQUIRED>
+    <!ATTLIST project path     CDATA #IMPLIED>
+    <!ATTLIST project remote   IDREF #IMPLIED>
+    <!ATTLIST project revision CDATA #IMPLIED>
+  
+    <!ELEMENT remove-project (EMPTY)>
+    <!ATTLIST remove-project name  CDATA #REQUIRED>
+  ]>
+
+A description of the elements and their attributes follows.
+
+
+Element manifest
+----------------
+
+The root element of the file.
+
+
+Element remote
+--------------
+
+One or more remote elements may be specified.  Each remote element
+specifies a Git URL shared by one or more projects and (optionally)
+the Gerrit review server those projects upload changes through.
+
+Attribute `name`: A short name unique to this manifest file.  The
+name specified here is used as the remote name in each project's
+.git/config, and is therefore automatically available to commands
+like `git fetch`, `git remote`, `git pull` and `git push`.
+
+Attribute `fetch`: The Git URL prefix for all projects which use
+this remote.  Each project's name is appended to this prefix to
+form the actual URL used to clone the project.
+
+Attribute `review`: Hostname of the Gerrit server where reviews
+are uploaded to by `repo upload`.  This attribute is optional;
+if not specified then `repo upload` will not function.
+
+Element default
+---------------
+
+At most one default element may be specified.  Its remote and
+revision attributes are used when a project element does not
+specify its own remote or revision attribute.
+
+Attribute `remote`: Name of a previously defined remote element.
+Project elements lacking a remote attribute of their own will use
+this remote.
+
+Attribute `revision`: Name of a Git branch (e.g. `master` or
+`refs/heads/master`).  Project elements lacking their own
+revision attribute will use this revision.
+
+
+Element manifest-server
+-----------------------
+
+At most one manifest-server may be specified. The url attribute
+is used to specify the URL of a manifest server, which is an
+XML RPC service that will return a manifest in which each project
+is pegged to a known good revision for the current branch and
+target.
+
+The manifest server should implement:
+
+  GetApprovedManifest(branch, target)
+
+The target to use is defined by environment variables TARGET_PRODUCT
+and TARGET_BUILD_VARIANT. These variables are used to create a string
+of the form $TARGET_PRODUCT-$TARGET_BUILD_VARIANT, e.g. passion-userdebug.
+If one of those variables or both are not present, the program will call
+GetApprovedManifest without the target paramater and the manifest server
+should choose a reasonable default target.
+
+
+Element project
+---------------
+
+One or more project elements may be specified.  Each element
+describes a single Git repository to be cloned into the repo
+client workspace.
+
+Attribute `name`: A unique name for this project.  The project's
+name is appended onto its remote's fetch URL to generate the actual
+URL to configure the Git remote with.  The URL gets formed as:
+
+  ${remote_fetch}/${project_name}.git
+
+where ${remote_fetch} is the remote's fetch attribute and
+${project_name} is the project's name attribute.  The suffix ".git"
+is always appended as repo assumes the upstream is a forrest of
+bare Git repositories.
+
+The project name must match the name Gerrit knows, if Gerrit is
+being used for code reviews.
+
+Attribute `path`: An optional path relative to the top directory
+of the repo client where the Git working directory for this project
+should be placed.  If not supplied the project name is used.
+
+Attribute `remote`: Name of a previously defined remote element.
+If not supplied the remote given by the default element is used.
+
+Attribute `revision`: Name of the Git branch the manifest wants
+to track for this project.  Names can be relative to refs/heads
+(e.g. just "master") or absolute (e.g. "refs/heads/master").
+Tags and/or explicit SHA-1s should work in theory, but have not
+been extensively tested.  If not supplied the revision given by
+the default element is used.
+
+Element remove-project
+----------------------
+
+Deletes the named project from the internal manifest table, possibly
+allowing a subsequent project element in the same manifest file to
+replace the project with a different source.
+
+This element is mostly useful in the local_manifest.xml, where
+the user can remove a project, and possibly replace it with their
+own definition.
+
+
+Local Manifest
+==============
+
+Additional remotes and projects may be added through a local
+manifest, stored in `$TOP_DIR/.repo/local_manifest.xml`.
+
+For example:
+
+  $ cat .repo/local_manifest.xml
+  <?xml version="1.0" encoding="UTF-8"?>
+  <manifest>
+    <project path="manifest"
+             name="tools/manifest" />
+    <project path="platform-manifest"
+             name="platform/manifest" />
+  </manifest>
+
+Users may add projects to the local manifest prior to a `repo sync`
+invocation, instructing repo to automatically download and manage
+these extra projects.