Clarify the [Skip] flag and add an if-then-else example

<directive module="mod_rewrite">RewriteRule</directive> immediately

following it. Thus, if you want to make a <code>RewriteCond</code> apply

to several <code>RewriteRule</code>s, one possible technique is to

negate those conditions and use a [Skip] flag. So, you can 

negate those conditions and add a <code>RewriteRule</code> with a [Skip] flag. You can

use this to make pseudo if-then-else constructs: The last rule of

the then-clause becomes <code>skip=N</code>, where N is the

number of rules in the else-clause.</p>

number of rules in the else-clause:</p>

<example>

# Does the file exist?<br />

RewriteCond %{REQUEST_FILENAME} !-f<br />

RewriteCond %{REQUEST_FILENAME} !-d<br />

# Create an if-then-else construct by skipping 3 lines if we meant to go to the &quot;else&quot; stanza.<br />

RewriteRule .? - [S=3]<br />

<br />

# IF the file exists, then:

<indent>

	RewriteRule (.*\.gif) images.php?$1<br />

	RewriteRule (.*\.html) docs.php?$1<br />

	# Skip past the &quot;else&quot; stanza.<br />

	RewriteRule .? - [S=1]<br />

</indent>

# ELSE...

<indent>

	RewriteRule (.*) 404.php?file=$1<br />

</indent>

# END

</example>

</section>

<section id="flag_t"><title>T|type</title>