clarify scope of dataspaces CG

[VladimirAlexiev]

@pietercolpaert @JohannesLipp
Can you please clarify whether this group is about EU dataspaces as per IDSA, EDC, GXFS, SIMPL etc?
@TallTed argues in #6 that the scope perhaps also includes OpenLink Data Spaces

The group announcement is not specific about this point:

• https://www.w3.org/community/dataspaces/
  https://www.w3.org/groups/cg/dataspaces/
  Dataspaces gather requirements for seamless and trusted data exchange within specific domains and translate the requirements into technical specifications. The W3C already recommends standards for trust, interoperability, and data value. Our goal in this group is to collect scenarios from the dataspaces built by our members and manage best practices for implementing them with W3C specifications. Where those standards are not sufficient, we envision formulating questions to other community and working groups, and providing dataspace-specific normative text for specific scenarios. The Dataspaces Community Group aims to meet every year at the ESWC conference.
• Ted points to the README which is also not specific on this point
• The "ESWC conference" mentioned in the announcement refers to the Semantics in Dataspaces (SDS) workshop, and there are links in the README.
  The current call is https://dbis.rwth-aachen.de/SDS25/ and it refers to "the European Union is spending 4-6 billion Euros to establish dataspaces"

[TallTed]

I'm suggesting that "dataspace" is a generic term, within which category both "EU dataspaces" and "OpenLink Data Spaces" may reasonably be counted. I'm sure there are other implementation efforts that also fall under this, to my eye, loosely defined umbrella.