成员的完整列表，这些成员属于 FoxitPDFSDKPython3.Metadata,包括所有继承而来的类成员

GetCreationDateTime()	FoxitPDFSDKPython3.Metadata
GetCustomerKeys()	FoxitPDFSDKPython3.Metadata
GetModifiedDateTime()	FoxitPDFSDKPython3.Metadata
GetValues(key)	FoxitPDFSDKPython3.Metadata
HasKey(key)	FoxitPDFSDKPython3.Metadata
IsEmpty()	FoxitPDFSDKPython3.Metadata
Metadata(document)	FoxitPDFSDKPython3.Metadata
Metadata(other)	FoxitPDFSDKPython3.Metadata
RemoveCustomerKey(key)	FoxitPDFSDKPython3.Metadata
SetCreationDateTime(date_time)	FoxitPDFSDKPython3.Metadata
SetModifiedDateTime(date_time)	FoxitPDFSDKPython3.Metadata
SetValues(key, value_array)	FoxitPDFSDKPython3.Metadata