api-el/src/main/java/org/ocpsoft/rewrite/el/El.java
public static El properties(final Field submit, final Field retrieve)
   {
      return new ElProperties(new TypeBasedExpression(submit.getDeclaringClass(), submit.getName()),
               new TypeBasedExpression(retrieve.getDeclaringClass(), retrieve.getName()));
   }
public static El properties(final Field submit, final Field retrieve)
   {
      return new ElProperties(new TypeBasedExpression(submit.getDeclaringClass(), submit.getName()),
               new TypeBasedExpression(retrieve.getDeclaringClass(), retrieve.getName()));
   }
Create a new EL Value binding using a single expression to submit and retrieve values. The specified property must
either be public, or have a publicly defined getter/setter. Instead of an EL expression this method expects a
{@link Field} argument. The EL expression will be automatically created at runtime.