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+This repository holds supplementary Go libraries for text processing, many involving Unicode.
+
+
+# Semantic Versioning
+This repo uses Semantic versioning (http://semver.org/), so
+1. MAJOR version when you make incompatible API changes,
+1. MINOR version when you add functionality in a backwards-compatible manner,
+   and
+1. PATCH version when you make backwards-compatible bug fixes.
+
+A Unicode major and minor version bump is mapped to a major version bump in
+x/text.
+A path version bump in Unicode is mapped to a minor version bump in x/text.
+Note that, consistent with the definitions in semver, until version 1.0.0 of
+x/text is reached, the minor version is considered a major version.
+So going from 0.1.0 to 0.2.0 is considered to be a major version bump.
+
+A major new CLDR version is mapped to a minor version increase in x/text.
+Any other new CLDR version is mapped to a patch version increase in x/text.
+
+
+# Contribute
+To submit changes to this repository, see http://golang.org/doc/contribute.html.
+
+To generate the tables in this repository (except for the encoding tables),
+run go generate from this directory. By default tables are generated for the
+Unicode version in core and the CLDR version defined in
+golang.org/x/text/unicode/cldr.
+
+Running go generate will as a side effect create a DATA subdirectory in this
+directory, which holds all files that are used as a source for generating the
+tables. This directory will also serve as a cache.
+
+## Testing
+Run
+
+    go test ./...
+
+from this directory to run all tests. Add the "-tags icu" flag to also run
+ICU conformance tests (if available). This requires that you have the correct
+ICU version installed on your system.
+
+## Versions
+To update a Unicode version run
+
+    UNICODE_VERSION=x.x.x go generate
+
+where `x.x.x` must correspond to a directory in http://www.unicode.org/Public/.
+If this version is newer than the version in core it will also update the
+relevant packages there. The idna package in x/net will always be updated.
+
+To update a CLDR version run
+
+    CLDR_VERSION=version go generate
+
+where `version` must correspond to a directory in
+http://www.unicode.org/Public/cldr/.
+
+Note that the code gets adapted over time to changes in the data and that
+backwards compatibility is not maintained.
+So updating to a different version may not work.
+
+The files in DATA/{iana|icu|w3|whatwg} are currently not versioned.