drools-eclipse/org.guvnor.eclipse.webdav/src/interface/org/eclipse/webdav/dom/PropertyUpdate.java
public Prop addSet() {
        Element set = appendChild(root, "set"); //$NON-NLS-1$
        Element prop = appendChild(set, "prop"); //$NON-NLS-1$
        try {
            return new Prop(prop);
        } catch (MalformedElementException e) {
            Assert.isTrue(false, Policy.bind("assert.internalError")); //$NON-NLS-1$
            return null; // Never reached.
        }
    }
public Prop addSet() {
        Element set = appendChild(root, "set"); //$NON-NLS-1$
        Element prop = appendChild(set, "prop"); //$NON-NLS-1$
        try {
            return new Prop(prop);
        } catch (MalformedElementException e) {
            Assert.isTrue(false, Policy.bind("assert.internalError")); //$NON-NLS-1$
            return null; // Never reached.
        }
    }
Adds a set to the given propertyupdate and returns an editor on its
prop.

@return an editor on a new prop