drools-eclipse/org.guvnor.eclipse.webdav/src/interface/org/eclipse/webdav/dom/PropFind.java
public Prop setProp() {
        Assert.isTrue(getFirstChild(root, new String[] {"allprop", "propname"}) == null); //$NON-NLS-1$ //$NON-NLS-2$
        Element prop = setChild(root, "prop", new String[] {"prop"}, true); //$NON-NLS-1$ //$NON-NLS-2$
        try {
            return new Prop(prop);
        } catch (MalformedElementException e) {
            Assert.isTrue(false, Policy.bind("assert.internalError")); //$NON-NLS-1$
            return null; // Never reached.
        }
    }
public Prop setProp() {
        Assert.isTrue(getFirstChild(root, new String[] {"allprop", "propname"}) == null); //$NON-NLS-1$ //$NON-NLS-2$
        Element prop = setChild(root, "prop", new String[] {"prop"}, true); //$NON-NLS-1$ //$NON-NLS-2$
        try {
            return new Prop(prop);
        } catch (MalformedElementException e) {
            Assert.isTrue(false, Policy.bind("assert.internalError")); //$NON-NLS-1$
            return null; // Never reached.
        }
    }
Creates and sets a new prop on this propfind and returns an editor on
it. This propfind must not already be in the "all prop" or "prop
name" form.

@return an editor on a new prop element