How can Hibernate specify a relative path to a db file?

Question

Hibernate

There is a line in the hibernate.cfg.xml file :

<property name="hibernate.connection.url">
    jdbc:firebirdsql://localhost:3050/W:/Work/project/database/BASE.FDB
</property>

That's how it works. But I want to specify not an absolute, but a relative path to the database file.
The project structure is:
project
|- config
| | -hibernate.cfg.xml
|- database
| | - BASE.FDB

Tried all sorts of type options

jdbc:firebirdsql://localhost:3050/./../database/BASE.FDB

but doesn't want to.
Is it possible to set a relative path for Hibernate? And if so, how?