Constructor.
The schema XML data (of the schema that names the merge group).
A collection of schema entries.
Optionalprefix: string = ''
This schema's prefix in the active schema set.
The collection of schema entries.
The HED library schema name.
This schema's prefix in the active schema set.
The HED schema version.
The standard HED schema version this schema is linked to.
An imported HED schema (a merge group under one prefix).