Builder
constructor(title: String, type: Int, href: Url, metadata: OpdsMetadata.Builder = OpdsMetadata.Builder(title = title), links: MutableList<Link> = mutableListOf(), facets: MutableList<Facet.Builder> = mutableListOf(), groups: MutableList<Group.Builder> = mutableListOf(), publications: MutableList<Publication> = mutableListOf(), navigation: MutableList<Link> = mutableListOf(), context: MutableList<String> = mutableListOf())