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+<!DOCTYPE html>
+
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <title>Start and Finish Ranges - Packrat Docs</title>
+    <link href="default.css" rel="stylesheet">
+  </head>
+
+  <body>
+
+
+  <h2>Start and Finish Ranges</h2>
+
+  <a href="index.html">Return to Contents</a>
+
+
+  <p>When parsing input, the start position and finish position that
+  describe a parsed or lexed chunk are the index of the first item and
+  the last item of that chunk. This was done to match the idea with
+  how array slicing is done in Ada, but it has a few other implications.</p>
+
+  <p>Empty chunks are described by a finish position that is less than
+  the start position. For consistency, this is always done as the finish
+  position being only one less than the start.</p>
+
+  <p>This convention also differs from the convention used by Frost, Hafiz,
+  and Callaghan (2008). They used start positions corresponding to the first
+  item in a chunk, but finish positions corresponding to the first item after
+  the chunk had ended. Care should be taken to keep this in mind to avoid
+  off-by-one errors.</p>
+
+
+  </body>
+</html>
+