Update building meter example to use REC classes instead of deprecated Brick location classes

[Copilot]

The building electrical meter example was using deprecated Brick 1.4 location classes that have been replaced by RealEstateCore (REC) classes. This made it difficult for users to implement building electrical meters properly, as the example referenced deprecated classes like brick:Building, brick:Floor, and brick:Site.

Changes Made

This PR updates the examples/building_meter/building_meter.ttl file to use the current Brick 1.4 schema recommendations:

• Added REC namespace: @prefix rec: <https://w3id.org/rec#>
• Replaced deprecated classes with REC equivalents:
  • brick:Building → rec:Building
  • brick:Floor → rec:Level
  • brick:Site → rec:Site
• Updated spatial relationships: brick:hasPart/brick:isPartOf → rec:hasPart/rec:isPartOf

Before and After

Before (deprecated):

bldg:mysite a brick:Site ;
    brick:hasPart bldg:mybldg .
bldg:mybldg a brick:Building ;
    brick:isMeteredBy bldg:main-meter .
bldg:floor1 a brick:Floor ;
    brick:isPartOf bldg:mybldg .

After (REC compliant):

bldg:mysite a rec:Site ;
    rec:hasPart bldg:mybldg .
bldg:mybldg a rec:Building ;
    brick:isMeteredBy bldg:main-meter .
bldg:floor1 a rec:Level ;
    rec:isPartOf bldg:mybldg .

Validation

• ✅ All existing tests pass
• ✅ Spatial hierarchy preserved (site → building → floors)
• ✅ Metering relationships intact (building and floor metering works correctly)
• ✅ Example loads successfully with 55 triples
• ✅ Provides proper reference implementation for building electrical metering in Brick 1.4

The updated example now serves as a correct reference for implementing building electrical meters with the latest Brick schema, using REC classes instead of deprecated location classes.

Fixes #709.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[Copilot]

@gtfierro 👋 This repository doesn't have Copilot instructions. With Copilot instructions, I can understand the repository better, work faster and produce higher quality PRs.

I can generate a .github/copilot-instructions.md file for you automatically. Click here to open a pre-filled issue and assign it to me. I'll write the instructions, and then tag you for review.