Returns layer Id for given name. Creates new layer if it's missing

true for extended names

If the symbol name was repaired, then newName is a repaired symbol name. newName is empty if oldName did not need any repairing. allowVerticalBar is a boolean to indicate if vertical bars are allowed in the symbol name

This method validates name according to the rules for extended (AutoCAD 2000 and later) symbol names. allowVerticalBar is a boolean to indicate if vertical bars are allowed in the symbol name