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diff --git a/hugofs/base_fs.go b/hugofs/base_fs.go
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+// Copyright 2018 The Hugo Authors. All rights reserved.
+//
+// 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 hugofs
+
+import (
+	"github.com/spf13/afero"
+)
+
+// BaseFs contains the core base filesystems used by Hugo. The name "base" is used
+// to underline that even if they can be composites, they all have a base path set to a specific
+// resource folder, e.g "/my-project/content". So, no absolute filenames needed.
+type BaseFs struct {
+	// The filesystem used to capture content. This can be a composite and
+	// language aware file system.
+	ContentFs afero.Fs
+
+	// The filesystem used to store resources (processed images etc.).
+	// This usually maps to /my-project/resources.
+	ResourcesFs afero.Fs
+
+	// The filesystem used to publish the rendered site.
+	// This usually maps to /my-project/public.
+	PublishFs afero.Fs
+}