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SDO_Model_Type::isOpenType — Test to see if this type is an open type
此函数是实验性的。此函数的表象，包括名称及其相关文档都可能在未来的 PHP 发布版本中未通知就被修改。使用本函数风险自担 。
Test to see if this type is open.
Returns TRUE if this type is open, otherwise returns FALSE. An
SDO_DataObject whose type is open can have properties added to them which
are not described by the type. This capability is used to support
working with XML documents whose schema support open content, such as that
defined by an
<xsd:any>
None.
Returns TRUE if this type is open, otherwise returns FALSE.