XML with ':' in it... messing things up!

Ok so here’s the XML I’m working with:

<yweather:units temperature="F" distance="mi" pressure="in" speed="mph"/>
<yweather:wind chill="64"   direction="350"   speed="6" />
<yweather:atmosphere humidity="30"  visibility="10"  pressure="30.24"  rising="0" />
<yweather:astronomy sunrise="7:20 am"   sunset="7:36 pm"/>

I’m trying to access those attributes, but don’t know how. Any help appreciated. Thanks!