Create non-functional-requirements.md

non-functional-requirements.md

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+# Non-functional requirements
+
+Metadata can come in many different flavors and therefore should allow to be used in multiple contexts.
+
+## 1) Supported serialization formats
+
+In general, metadata in a RDF format is preferred since it enables it to be stored in triple store databases.
+This means the preferred serialization formats are RDF/XML, JSON-LD, Turtle, N3 and Ntriples.
+
+
+Nevertheless, other standardized formats as XML, JSON, YAML and TOML are also valid and can be used.
+
+## 2) Provided schema files
+
+Schema files shall be provided as Turtle/Notation3 and as JSON schema. Both for standard JSON and JSON-LD?!