code: public int getAttributeValueAsInteger(final String _key)
          throws EFapsException
      {
          final String value = getAttributeValue(_key);
          return value == null ? 0 : Integer.parseInt(value);
      }
docs: Returns for given <code>_key</code> the related integer attribute value.
  If no attribute is found <code>0</code> is returned.
  
  @param _key key of searched attribute
  @return found integer attribute value; if not found <code>0</code>
  @throws EFapsException on error
  @see #attributes