Upstream and downstream

# Upstream: Zone ← VAV ← AHU ← Heat_Exchanger
zone(name: "Library") {
  fedBy { name type }
}

# Downstream: AHU → VAV → Zone
equipment(id: "TE01-XX-AHU-001") {
  downstream {
    name
    type
  }
}

{
  zone(name: "Library") {
    upstream {
      name
      type
    }
  }
}

{
  zone(name: "Library") {
    upstream {
      name
      type
      points(is: "Temperature_Sensor") {
        type
        currentValue { value timestamp }
      }
    }
  }
}

{
  equipment(id: "TE01-XX-AHU-001") {
    upstream(medium: "HOT_WATER") {
      name
      type
    }
  }
}

{
  equipment(id: "TE01-XX-AHU-001") {
    downstream(is: "HVAC_Zone") {
      name
      type
    }
  }
}

{
  zone(name: "Library") {
    upstream(maxDepth: 1) {
      name
      type
    }
  }
}

?zone ^brick:feeds+ ?equipment .

?equipment brick:feeds+ ?target .