  The Semantic Web research community understood since its beginning how
crucial it is to equip practitioners with methods to transform non-RDF
resources into RDF. Proposals focus on either engineering content
transformations or accessing non-RDF resources with SPARQL. Existing solutions
require users to learn specific mapping languages (e.g. RML), to know how to
query and manipulate a variety of source formats (e.g. XPATH, JSON-Path), or to
combine multiple languages (e.g. SPARQL Generate). In this paper, we explore an
alternative solution and contribute a general-purpose meta-model for converting
non-RDF resources into RDF: Facade-X. Our approach can be implemented by
overriding the SERVICE operator and does not require to extend the SPARQL
syntax. We compare our approach with the state of art methods RML and SPARQL
Generate and show how our solution has lower learning demands and cognitive
complexity, and it is cheaper to implement and maintain, while having
comparable extensibility and efficiency.
