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"In order to lower the barrier for developers towards Linked Data consumption, the Linked Open Data cloud needs to be queryable with GraphQL as well. In this article, we introduce GraphQL-LD, an approach that consists of a method for transforming GraphQL queries coupled with a JSON-LD context to SPARQL, and a method for converting SPARQL results to the GraphQL query-compatible response. "

"In this article, we'll discuss one of the most confusing but important topics of RDF: the various ways you can create ordered data."

An online book describing validation of RDF data. Given the JSON-LD view of ActivityPub/AS2 is an RDF serialization, these tools and techniques apply there as well. It also gives a good overview of the RDF data model and related benefits and challenges.

A new solution space for apps emerges if we adopt a different model for thinking about Solid. This article discusses a hybrid document/graph model.

A scheme based on RDF allowing for data to be referred to by an identifier determined by the data itself

This is the AS2 OWL ontology which was abandoned in 2016 (not fully working or complete).

The Web Ontology Language OWL is a semantic markup language for publishing and sharing ontologies on the World Wide Web. OWL is developed as a vocabulary extension of RDF (the Resource Description Framework) and is derived from the DAML+OIL Web Ontology Language. This document contains a structured informal description of the full set of OWL language constructs and is meant to serve as a reference for OWL users who want to construct OWL ontologies.

The Resource Description Framework (RDF) is a general-purpose language for representing information on the Web. This document defines a textual syntax for RDF called Turtle that allows an RDF graph to be completely written in a compact and natural text form, with abbreviations for common usage patterns and datatypes. Turtle provides levels of compatibility with the N-Triples [N-TRIPLES] format as well as the triple pattern syntax of the SPARQL W3C Recommendation.

Owlready2 is a package for ontology-oriented programming in Python. It can load OWL 2.0 ontologies as Python objects, modify them, save them, and perform reasoning via HermiT (included). Owlready2 allows a transparent access to OWL ontologies (contrary to usual Java-based API).