Merge pull request #875 from eriksiegel/Issue-771

Attempt to resolve #771

xproc/src/main/xml/specification.xml

@@ -5726,10 +5726,10 @@ See also <xref linkend="handling-imports"
         incorrect notification of duplicate step definitions. It is not an error for a library to
         import itself. An example of such steps is listed in <xref linkend="handling-imports"
         />.</para>
-<para>A library is considered the same library if the URI of the resource
-        retrieved is the same. If a pipeline or library author uses two different URI values that
-        resolve to the same resource, they must not be considered the same imported
-        library.</para>
+      <para>A library is considered the same library if the base URI of the resource retrieved is
+        the same. If different base URIs resolve to the same library (for instance when a web server
+        returns the same document on different URLs), they must <emphasis>not</emphasis> be
+        considered the same imported library.</para>
 
 </section>