Text Formatting ⇒ hyperref | Lowercase for Metadata

[heavytull]

I'm using hyperref package in a class file. To define its options such as "pdftitle" I'm using variables, but I would like to assign them lowercase only. The command \MakeLowercase does not work in such circumstances and returns an error such as:

Code: Select all

! Undefined control sequence.
\MakeLowercase ...owercaseUnsupportedInPdfStrings

I guess I can use another variable somewhere else in the file assigned with \MakeLowercase{\originalvariable}, \originalvariable being the variable containing case unchanged information. But is there any simpler solution?

[heavytull]

I defined a new variable (newvar) as \def\@newvar{\MakeLowercase{\@originalvariable}} and used \@newvar to options of hyperref with \hypersetup. The result is the same and occurs with the same message.