//if (! _reference->isReferenceBlock()) throw(Exception(BLOCK_INVALID_TYPE));\r
//if (! _group->isGroupBlock()) throw(Exception(BLOCK_INVALID_TYPE));\r
reference = _reference;\r
//if (! _reference->isReferenceBlock()) throw(Exception(BLOCK_INVALID_TYPE));\r
//if (! _group->isGroupBlock()) throw(Exception(BLOCK_INVALID_TYPE));\r
reference = _reference;\r