Keys (easy one) match on name()

I have a bunch of <field/> elements who all contain the attribute
name.  How do I set up a key to return the field element passing given
name?

I've tried this, but doesn't seem to work:

    <xsl:key name="key_fld" match="field" use="name()"/>

I've also tried:

    <xsl:key name="key_fld" match="field" use="@*[name()]>

Thanks for the help.