base objects

• Prototype - based objects
  基于原型的对象
• Searches the whole subtree , including the base object and all its child objects
  搜索整个子树，包括基对象及其所有子对象。
• Searches the immediate child objects of the base object , excluding the base object
  搜索基对象的直接子对象，但不搜索基对象。
• The synonym is specified instead of the base object in ddl and dml statements
  在ddl和dml语句中，指定的是同义词而不是基对象。
• Class - based objects
  >基于类的对象
• Classic pixel - based object shadow detection algorithm limits the performance , owing to noise
  传统的基于像素的阴影检测算法易受噪声的影响。
• All existence , type , and permissions checking on the base object is deferred until run time
  对基对象的存在性、类型和权限检查都在运行时执行。
• Dereferences aliases when both searching subordinates and locating the base object of the search
  在搜索次级和定位搜索的基对象时取消引用别名。
• Dereferences aliases when both searching subordinates and locating the base objects of the search
  在搜索次级和定位搜索的基对象时取消引用别名。
• Dereferences aliases when locating the base object , but not when searching its subordinates
  在定位基对象（而不是在搜索它的次级）时取消引用别名。