|Implicit Conversions||(standard MDX)|
MDX automatically converts several types (aka. implicit conversions).
MDX converts implicitly (automatically) some types if required by the context.
As an example, if a function is expecting a member as first parameter and receives a hierarchy MDX is going to implicitly convert the hierarchy into a member using the hierarchy's default member.
For readability, it is not advised to use implicit conversions as the actual value used is hidden to somebody not aware of the conversion happening in the background.
Find here the value of the XMLA properties when not specified otherwise.