/usr/lib/x86_64-linux-gnu/ada/ is in libxmlada-schema7-dev 17.1.2017-5.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/ada/adalib/
/usr/lib/x86_64-linux-gnu/ada/adalib/xmlada_schema/
/usr/lib/x86_64-linux-gnu/ada/adalib/xmlada_schema/schema-date_time.ali
/usr/lib/x86_64-linux-gnu/ada/adalib/xmlada_schema/schema-decimal.ali
/usr/lib/x86_64-linux-gnu/ada/adalib/xmlada_schema/schema-dom_readers.ali
/usr/lib/x86_64-linux-gnu/ada/adalib/xmlada_schema/schema-readers.ali
/usr/lib/x86_64-linux-gnu/ada/adalib/xmlada_schema/schema-schema_readers.ali
/usr/lib/x86_64-linux-gnu/ada/adalib/xmlada_schema/schema-simple_types.ali
/usr/lib/x86_64-linux-gnu/ada/adalib/xmlada_schema/schema-validators-xsd_grammar.ali
/usr/lib/x86_64-linux-gnu/ada/adalib/xmlada_schema/schema-validators.ali
/usr/lib/x86_64-linux-gnu/ada/adalib/xmlada_schema/schema.ali