Github user uce commented on a diff in the pull request:
https://github.com/apache/flink/pull/1645#discussion_r53139307
--- Diff: docs/apis/common/index.md ---
@@ -0,0 +1,1356 @@
+---
+title: "Basic Concepts"
+
+# Top-level navigation
+top-nav-group: apis
+top-nav-pos: 1
+top-nav-title: <strong>Basic Concepts</strong>
+
+# Sub-level navigation
+sub-nav-group: common
--- End diff --
Maybe we can comment these lines out, because this is currently just a
single page. It shows a navigation at the left side with only one element. Or
do you think that we will add sub pages soon?
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