Construct XML with dynamic label and attributes in Scala?

I want to be able to do this:

val myXml = <myTag { someAttributes }> </myTag>

(because I don't know what the attribute details are at compile time)

and this:

val myXml = <{someTag}></{someTag}>

This isn't valid Scala syntax. The closest I can come is using the Elem object to construct elements, but it's being a little troublesome (inserting PCDATA where I don't want it to). Is there any way of doing it like the above?