@verb #5406:":replaceChild" this none this rxdo #7788
@program #5406:":replaceChild" this none this
"  Node replaceChild(in Node newChild, in Node oldChild) raises(DOMException);"
""
"Replaces the child node oldChild with newChild in the list of children, and returns the oldChild node.  If newChild is a DocumentFragment object, oldChild is replaced by all of the DocumentFragment children, which are inserted in the same order.  If the newChild is already in the tree, it is first removed."
"Removes the child node indicated by oldChild from the list of children, and returns it."
"  oldChild of type Node -> the node being removed."
{newChild, oldChild} = args
this->insertBefore(newChild, oldChild)
return this->removeChild(oldChild)
"Last modified by Floyd (#7788) on Thu Nov 14 18:30:38 2002 MST."
.