mod_rewrite.xml: add an example about override behavior

A user in PR 63051 was confused about the default behavior
of mod_rewrite (override) when merging two sections in the
directory context at the same nesting level. I was confused
as well, but after a quick look at the code I figured out that
RewriteOptions Inherit seems to solve the issue (naming is,
in this case, a bit counter intuitive). I hope that I added
a good clarification in the code, if not please amend it as
you think it's best!

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1853280 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/docs/manual/mod/mod_rewrite.xml b/docs/manual/mod/mod_rewrite.xml
index 28b7799ae7da03804687b01e0b06eb4c5e30117a..c3816eb149d86fe9018df7c10293f89168ecae19 100644 (file)
--- a/docs/manual/mod/mod_rewrite.xml
+++ b/docs/manual/mod/mod_rewrite.xml
@@ -1141,7 +1141,35 @@ type="section" module="core">Files</directive> sections
 (including their regular expression counterparts), this
 should never be necessary and is unsupported. A likely feature
 to break in these contexts is relative substitutions.</li>
+
+<li>The <directive module="core">If</directive> blocks
+follow the rules of the <em>directory</em> context.</li>
+
+<li>By default, mod_rewrite overrides rules when <a href="../sections.html#merging">
+merging sections</a> belonging to the same context. The <directive
+module="rewrite">RewriteOptions</directive> directive can change this behavior,
+for example using the <em>Inherit</em> setting.</li>
+
+<li>The <directive module="rewrite">RewriteOptions</directive> also regulates the
+behavior of sections that are stated at the same nesting level of the configuration. In the
+following example, by default only the RewriteRules stated in the second 
+<directive module="core">If</directive> block
+are considered, since the first ones are overridden. Using <directive
+module="rewrite">RewriteOptions</directive> Inherit forces mod_rewrite to merge the two
+sections and consider both set of statements, rather than only the last one.</li>
 </ul>
+<example>
+<highlight language="config">
+&lt;If "true"&gt;
+  # Without RewriteOptions Inherit, this rule is overridden by the next
+  # section and no redirect will happen for URIs containing 'foo'
+  RewriteRule foo http://example.com/foo [R]
+&lt;/If&gt;
+&lt;If "true"&gt;
+  RewriteRule bar http://example.com/bar [R]
+&lt;/If&gt;
+</highlight>
+</example>
 </note>
 
       <p>For some hints on <glossary ref="regex">regular