XML Support?

Hi, I'm currently using XEmacs 21.4.13 and I'm trying to editing XML files but the tabbing (i.e. indentation) is missing or disabled.  Is there anyway to enable it or
is there XML mode package that I can download that has this as well as syntax high-
lighting?  In short, I would like to do the following:

Given this:

<petstore>
<pet kind="Canine">
<name>Muffin</name>
<birthday>12/29/2000</birthday>
</pet>
</petstore>

I would like to tab/indent to this:

<petstore>
  <pet kind="Canine">
    <name>Muffin</name>
    <birthday>12/29/2000</birthday>
  </pet>
</petstore>

If anyone has any ideas as to how to do this, please post to the mailing list.

Thanks in advance,

-Conrad