From the Video’s Description on YouTube:
Partners of the Pan-Canadian Documentary Heritage Network (PCDHN) have developed a “proof-of-concept” to showcase a sampling of the network’s wealth of digital resources using “linked open data” and principles of the semantic web. The underlying premise is to expose the metadata for these resources using RDF/XML and existing/published ontologies (element sets) and vocabularies, maximizing discovery by a broad user community.
The partners selected the First World War as the topic for the digital resources to be contributed to the proof-of-concept. The metadata for these digital resources was provided by five partner institutions.
Source: Library and Archives Canada