请教一个openSchema方法的问题,急

范例在 OpenSchema 方法的 Criteria 参数中指定 TABLE_TYPE 查询约束。因此，只返回在 Pubs 数据库中指定的 Views 的纲要信息。然后该范例显示这些表的名称和类型。

Public Sub OpenSchemaX2()

Dim cnn2 As ADODB.Connection
Dim rstSchema As ADODB.Recordset
Dim strCnn As String

Set cnn2 = New ADODB.Connection
strCnn = "Provider=sqloledb;" & _
"Data Source=srv;Initial Catalog=pubs;User Id=sa;Password=; "
cnn2.Open strCnn

Set rstSchema = cnn2.OpenSchema(adSchemaTables, Array(Empty, Empty, Empty, "VIEW"))

Do Until rstSchema.EOF
Debug.Print "Table name: " & _
rstSchema!TABLE_NAME & vbCr & _
"Table type: " & rstSchema!TABLE_TYPE & vbCr
rstSchema.MoveNext
Loop
rstSchema.Close

cnn2.Close

End Sub

文中Set rstSchema = cnn2.OpenSchema(adSchemaTables, Array(Empty, Empty, Empty, "VIEW"))中的Array(Empty, Empty, Empty, "VIEW")的作用是什么?