Logtalk built-in predicate: current_logtalk_flag/2

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## `current_logtalk_flag/2`

#### Description

>     current_logtalk_flag(Flag, Value)

> Enumerates, by backtracking, the current Logtalk flag values.

#### Template and modes

>     current_logtalk_flag(?atom, ?atom)

#### Errors

> Flag is neither a variable nor an atom:
>   `type_error(atom, Flag)`
> Flag is not a valid flag:
>   `domain_error(valid_flag, Value)`

#### Examples

>     | ?- current_logtalk_flag(xml, Value).

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