| att.combinable provides attributes indicating how multiple references to
the same object in a schema should be combined | 
| Module | tagdocs — 22 Documentation Elements | 
| Members | valDesc valItem valList att.identified [moduleSpec schemaSpec elementSpec classSpec macroSpec constraintSpec attDef] | 
| Attributes | Attributes     | mode | specifies the effect of this declaration on its parent
    object. | Status | Optional |  | Legal values are: | addthis declaration is added to the current definitions [Default]deleteif present already, the whole of the declaration 
	  for this object is  removed from the current setupchangethis declaration changes the declaration of the same
    name in the current definitionreplacethis declaration replaces the declaration of the same
    name in the current definition
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  | Note | The informal meaning of the values for mode  is
as follows: 
 addthe object should be created  (processing
any children in add mode); raise an error if an object
with the same identifier already existsreplaceuse this object in preference to any existing object with the
same identifier, and ignore any children of that object;
process any new children in replace modedeletedo not process this object or any existing
object with the same identifier; raise an error if any new children
supplied
changeprocess this object, and process its children, and those
of any existing object with the same identifier, in change 
mode
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