In the context of database like storage they are indeed two primary keys even though they represent one point. That single point may be associated with multiple entries in the "database" even if it is a single point (assuming of course it represents a point on a two dimensional substantially unfolded surface).

Optimising for fewest key strokes only makes sense transmitting to Pluto or beyond

In reply to Re^2: Update XML Values using two primary keys by GrandFather
in thread Update XML Values using two primary keys by pratikpooja

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