Property Setting

[cwatson]

In trying to set a property, I've run into a wall.  From within a buildfile
I can do the following:

<property name="thing" value="sdasd asdasd asdasd" />

Done outside the buildfile, from the command line, I try:

ant -Dthing="sdasd asdasd asdasd" target

and it tries to find the target 'asdasd'.

Is there a way to set a property that has a space in it's contents from
outside ant?