https://help.syncfusion.com/cr/xamarin-ios/Syncfusion.XlsIO.FilterOperator.html
Class FilterOperator - Xamarin.iOS API Reference | Syncfusion
api referenceclassxamariniossyncfusion
https://docs.cloud.google.com/appengine/docs/standard/java-gen2/reference/services/bundled/latest/com.google.appengine.api.datastore.Query.FilterOperator
Enum Query.FilterOperator (5.0.0) | App Engine standard environment | Google Cloud Documentation
app engine