| att.combinable provides attributes indicating how multiple references to
the same object in a schema should be combined | 
| 組件 | tagdocs — 22 Documentation Elements | 
| 成員 | valDesc valItem valList att.identified [moduleSpec schemaSpec elementSpec classSpec macroSpec constraintSpec attDef] | 
| 屬性 | 屬性     | mode | specifies the effect of this declaration on its parent
    object. | 狀態 | 非必備的 |  | 合法的值是: | addthis declaration is added to the current definitions [預設值]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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