TL;DR Knowledge graph RAG retrieves connected entities and relationships before an LLM writes its answer, instead of relying only on similar text. That lets it answer multi-hop questions that plain vector search misses. The ontology is the part that makes those connections trustworthy. It defines which entity types exist, how they may relate, and what business terms mean. Without it,
TL;DR Rayfin, Fabric Apps, Power BI and Power Apps are four Microsoft tools that do four different jobs, so the right choice depends on what needs to be built. Rayfin is an open-source SDK and command-line tool that developers use to define and deploy an app backend in TypeScript. A Fabric App is the managed web app that Rayfin deploys
TL;DR Microsoft Rayfin is an open source tool that builds an app’s backend and deploys it straight onto Microsoft Fabric. One command sets up the database, login system, and API together. The app’s data lands in OneLake right away, with no separate step to move it into analytics. Rayfin is still in preview, so Microsoft has not set a launch
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