$$\begin{array}{r l}{={}}&{{}c o m\circ c l i_{e,e}(d p_{C},e d_{B})}\end{array}$$
$$R(d p_{C},s t_{B})$$
R(dpC *, st*B) = com ◦ clie,e(dpC *, ed*B)
$$\begin{array}{r l}{={}}&{{}c l i_{e,s}(d p_{A},s t_{C})}\\ {={}}&{{}c l i_{e,s}(d p_{A},e d_{C})}\\ {={}}&{{}c o m\circ c i_{s,e}(d p_{C},s t_{A})}\\ {={}}&{{}c o m\circ c i_{s,e}(d p_{C},e d_{A})}\end{array}$$
$$\begin{aligned} R(dp_A,st_C) & & \\ R(dp_A,ed_C) & & \\ R(dp_C,st_A) & & \\ \end{aligned}$$
$$R(d p_{C},e d_{A})$$
R(dpA*, st*C ) = clie,s(dpA*, st*C )
R(dpA*, ed*C ) = clie,s(dpA*, ed*C )
R(dpC *, st*A) = com ◦ clis,e(dpC *, st*A)
R(dpC *, ed*A) = com ◦ clis,e(dpC *, ed*A)
and we obtain the relation between dpA and dpB:
%(R(dpA, stB), R(dpA, edB), R(dpB, stA), R(dpB*, ed*A)). The relations between dB and dC as well as between dpA and dpC are derived analogously. The basic classifiers depend on the configuration in which the qcc realization lies and on the angle between the rays in the realization. They are constructed for an angle between the rays in the interval (π, 2 · π]. If the angle is in the interval (0, π], the LR relation between any line on the first ray and a point on the second just swaps. We capture this by introducing the operation com which is applied in this case. With it, we can limit the number of necessary primitive classifiers. The construction of the other basic classifiers is done analogously.

## 3.5 Extended Basic Classifiers For Drafp

For DRAfp, basically the same classifiers as described for DRAf in Section 3.4

![0_image_0.png](0_image_0.png)

are used. We simply extend them for the relations rrrr, rrll, llll and llrr to classify the information about qualitative angles. For this purpose, we have to have a look at the angles between dipoles in the realization of a given qcc. The qualitative angle between two dipoles dA and dB is called positive + (negative
−) if the angle from the carrier ray of dA called lA to the carrier ray of dB called lB lies in the interval (0, π) ((π, 2·π)). We give an example of this. Consider the configuration of a DRA scenario in Fig. 21 on the left hand side. On the right-