Gets a document from DynamoDB by key.
            
 Declaration Syntax
 Declaration Syntax| C# | 
public Document GetItem( IDictionary<string, DynamoDBEntry> key )
 Parameters
 Parameters- key (IDictionary<(Of <(<'String, DynamoDBEntry>)>)>)
- Values that make up the key of the document.
 Return Value
 Return ValueDocument from DynamoDB