minor Rules APIs improvement, taking inspiration from an idea described in DIGESTER-95; using the extended APIs users can contribute that feature just providing a customized Rules implementation rather than modifying the existing Digester code, forcing the custom-case cast as shown in the patch

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/digester/trunk@1139976 13f79535-47bb-0310-9956-ffa450edef68
16 files changed