Slice-level pindex and pid referenced from segment, but not defined at the slice level

[jordig100]

The the Segment definition, it states:

Name	Type	Use	Default	Annotation
v2	ST_ResourceIndex	required		References a zero-based index into the vertices for this slice. Defines the second vertex of the segment.
p1	ST_ResourceIndex			Overrides the slice-level pindex for the first vertex of the segment, which is v2 from the previous segment or startv from the parent polygon.
p2	ST_ResourceIndex			Overrides the slice-level pindex for the second vertex of the segment
pid	ST_ResourceID			Overrides the slice-level pid for the segment.

But there is no such a slice-level property.