code: public String lookupVariable(String variableName) {
  
          String varReference = XMLConfigConstants.VAR_OPEN + variableName + XMLConfigConstants.VAR_CLOSE;
          String resolvedVar = registry.resolveRawString(varReference);
  
          return varReference.equalsIgnoreCase(resolvedVar) ? null : resolvedVar;
  
      }
docs: Resolve the given variable.
  
  Formerly, this value was path-normalized (i.e, "//" is replaced
  with "/" and any trailing "/" are removed from the value).
  
  This has changed, at least temporarily, to not do path normalization for variables.
  
  @param variableName
  @return The resolved value or null if the variable doesn't exist