code: boolean hasAttribute(String attribute) {
          if(columnMetadata != null){
              if(columnMetadata.containsKey(attribute)){
                  return true;
              }else if(attribute.startsWith("\"") && attribute.endsWith("\"")){
                  return columnMetadata.containsKey(attribute.substring(1, attribute.length() - 1));
              }
          }
          return false;
      }
docs: returns true if this attribute is present in this meta model. This method i case insensitive.
  
  @param attribute attribute name, case insensitive.
  @return true if this attribute is present in this meta model, false of not.