Issue 225: proposal to resolve

Here is my proposal to resolve issue 225.

    Comments?

    

    -Anish

    --

    

    In section 3, for the case where there is no <sca:reference/>
    and no <sca:property> elements in the app context, replace the
    text

    

    "interface.java child element is present, with the interface
    attribute set to the fully qualified name of the interface class
    identified by the bean reference"

    

    with:

    

    "interface.java child element is present, with the interface
    attribute set as follows:

    

    
      
if only one bean refers to the bean reference, then the
        interface attribute is set to the fully qualified name of the
        interface class identified by the bean reference

      
if two or more beans refer to the bean reference, then:

      

    
    Let S be the set of fully qualified names of the
      interface classes identified by the bean references. ∀ s1,
      s2 ∈ S, s1 is either an ancestor or
      descendant of s2 in the class inheritance tree. If this
      condition does not hold true then the SCA runtime MUST raise an
      error [SPRxxxx]. The interface attribute is set to that member of
      S whose depth in the inheritance tree is the highest
      amongst all the members of S. I.e., it is set to the most
      specific subclass amongst all the interface classes identified by
      the bean references.

    
    For example, if two bean A and B refer to a bean
      reference C, and the interface class identified by bean A for
      reference C is I1, and that of bean B is I2, and if I2 is a
      subclass of I1, then the interface attribute value for the
      introspected implicit reference is set to I2.