<swish>
 <SomeDirective>true</SomeDirective>
 <PropertyNames>
  <foobar />
  <bar alias_for="foobar" />
  <date />
  <timestamp />
  <title alias_for="swishtitle" />
  <lastmod alias_for="swishlastmodified" />
 </PropertyNames>
 <MetaNames>
  <date bias="10" />
  <timestamp />
  <foobar /><!-- NO alias bar -->
  <time alias_for="timestamp" />
  <swishlastmodified />
  <fruit />
 </MetaNames>
 <TagAlias>
  <swishdescription>foo</swishdescription>
 </TagAlias>
 <UndefinedMetaTags>auto</UndefinedMetaTags>
 <Index>
  <Stemmer>none</Stemmer>
 </Index>
</swish>