RetractByType
The RetractByType function retracts all instances of a specified type in the working memory, whereas the Retractfunction retracts only specific items of a certain type. The following paragraphs describe how the RetractByType function works with entities of different types.
.NET Objects
All objects for a given class type are retracted from working memory. You simply drag the class from the .NET Classes fact pane into the RetractByType function.
TypedXmlDocument
All instances are retracted. This means that all TypedXmlDocuments with the same DocumentType.Selector are retracted. You should drag the appropriate node from the XML Schemas fact pane into the RetractByType function. Consistent with the Retract function, if you perform a RetractByType on the document root node, not only will all TypedXmlDocuments asserted with that DocumentType be retracted, but all child TypedXmlDocuments (XmlNodes in the tree hierarchy) associated with those parent TypedXmlDocuments will also be retracted.
TypedDataTable and DataConnection
Retract and RetractByType are equivalent for both TypedDataTable and DataConnection. Because DataSetName.DataTableName is a unique identifier for both types, there is only one instance in the engine at any point in time. As with Retract, you drag the table into the RetractByType function.