fractionAlongEdge property
The relative location along the non-spatial edge where the junction is (logically) located.
If this is a junction to a non-spatial edge connectivity association, this property represents how far the junction is located along the non-spatial edge, from 0.0 (the edge's start point) and 1.0 (the edge's end point).
If this association represents UtilityAssociationType.junctionEdgeObjectConnectivityToSide, the value will be 0.0, if UtilityAssociationType.junctionEdgeObjectConnectivityMidspan, the value will be between 0.0 and 1.0, and if UtilityAssociationType.junctionEdgeObjectConnectivityFromSide, the value will be 1.0.
This property is equivalent to percent along value in other parts of the ArcGIS platform. For example, ArcGIS REST /query and ArcGIS Pro Associations Table
The default value is 0.0.