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+// Copyright 2017, OpenCensus Authors
+//
+// 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.
+//
+
+/*
+Package tag contains OpenCensus tags.
+
+Tags are key-value pairs. Tags provide additional cardinality to
+the OpenCensus instrumentation data.
+
+Tags can be propagated on the wire and in the same
+process via context.Context. Encode and Decode should be
+used to represent tags into their binary propagation form.
+*/
+package tag // import "go.opencensus.io/tag"