type of the query section.

section name.

default is the section used if the query section is missing from the configuration file.

init ~artist ~album ~title creates a default section with artist, album and title.

of_section section parse section to create a query section. If an expected key is missing from section, the key is associated with its default value.

to_section query serializes query into a section.

fields query returns the fields used when matching substring node in a query.