According to my understanding of XML Schema, your wsdl snippet states that below the Request element, there can be only one element of any type. For more elements of any type, there should be maxOccurs="unbounded" present on the any element declaration.
See also this link for further explanation: http://www.w3schools.com/schema/el_any.asp
For creating OMElements, you can use code like this:
OMFactory fac = OMAbstractFactory.getOMFactory();
OMElement test1 = fac.createOMElement("test1", "", "");
OMElement t1 = fac.createOMElement("t", "", "");
t1.setText("1");
test1.addChild(t1);
Hope this helps. :)