I think attributes are not plugs in this case. As shown here, attribute is not a selection item in selection DAG
MItSelectionList::selItemType<file:///D:/Program%20Files/Autodesk/Maya2009/docs/Maya2009/en_US/API/class_m_it_selection_list.html#be4d283ac9f6e6b587c73786653b9a35>MItSelectionList::itemType ( MStatus<file:///D:/Program%20Files/Autodesk/Maya2009/docs/Maya2009/en_US/API/class_m_status.html>* *ReturnStatus* = NULL ) Returns the current selection item type. *Parameters:* [out] *ReturnStatus* Status code *Returns:* - kDagSelectionItem - selection item is in the DAG - kAnimSelectionItem - selection item is a keyset - kDNselectionItem - selection item is a dependency node *Status Codes:* - *MS::kSuccess<file:///D:/Program%20Files/Autodesk/Maya2009/docs/Maya2009/en_US/API/class_m_status.html#56eb564815df5f0ce06701dd325dc199b7a8c6b1718d8f48d382f568890b7a8f> * The selection item type was successfully returned - *MS::kFailure<file:///D:/Program%20Files/Autodesk/Maya2009/docs/Maya2009/en_US/API/class_m_status.html#56eb564815df5f0ce06701dd325dc1999226d4395386300442ced8468551141c> * Iterator error This is my opinion only. Subbu
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