22 files declare their use of SchemaGroupBase in Schema.org Metatag 8

SchemaArticle.php in schema_article/src/Plugin/metatag/Group/SchemaArticle.php

SchemaBook.php in schema_book/src/Plugin/metatag/Group/SchemaBook.php

SchemaCourse.php in schema_course/src/Plugin/metatag/Group/SchemaCourse.php

SchemaEvent.php in schema_event/src/Plugin/metatag/Group/SchemaEvent.php

SchemaHowTo.php in schema_how_to/src/Plugin/metatag/Group/SchemaHowTo.php

SchemaImageObject.php in schema_image_object/src/Plugin/metatag/Group/SchemaImageObject.php

SchemaItemList.php in schema_item_list/src/Plugin/metatag/Group/SchemaItemList.php

SchemaJobPosting.php in schema_job_posting/src/Plugin/metatag/Group/SchemaJobPosting.php

SchemaMetatagTestGroup.php in tests/modules/schema_metatag_test/src/Plugin/metatag/Group/SchemaMetatagTestGroup.php

SchemaMovie.php in schema_movie/src/Plugin/metatag/Group/SchemaMovie.php

SchemaOrganization.php in schema_organization/src/Plugin/metatag/Group/SchemaOrganization.php

SchemaPerson.php in schema_person/src/Plugin/metatag/Group/SchemaPerson.php

SchemaPlace.php in schema_place/src/Plugin/metatag/Group/SchemaPlace.php

SchemaProduct.php in schema_product/src/Plugin/metatag/Group/SchemaProduct.php

SchemaQAPage.php in schema_qa_page/src/Plugin/metatag/Group/SchemaQAPage.php

SchemaRecipe.php in schema_recipe/src/Plugin/metatag/Group/SchemaRecipe.php

SchemaReview.php in schema_review/src/Plugin/metatag/Group/SchemaReview.php

SchemaService.php in schema_service/src/Plugin/metatag/Group/SchemaService.php

SchemaSpecialAnnouncement.php in schema_special_announcement/src/Plugin/metatag/Group/SchemaSpecialAnnouncement.php

SchemaVideoObject.php in schema_video_object/src/Plugin/metatag/Group/SchemaVideoObject.php

SchemaWebPage.php in schema_web_page/src/Plugin/metatag/Group/SchemaWebPage.php

SchemaWebSite.php in schema_web_site/src/Plugin/metatag/Group/SchemaWebSite.php