LinkByName finds a link w/ one of the given names in the provided list.

FileTag indicates the link should "use" the input file as source.

We have legacy nodes structure that allowed us to add directories and "0" means the first directory Now we have only one directory in which we have either single file or image variants.

SingleFileTag is a magic key indicating that a directory is actually a single file.

ErrEmptySchema indicates a schema is empty.

ErrLinkOrderNotSolvable.