Definition

The following constraints apply:

1. For a <Feature Face Ring> instance R that associates to <Feature Edge> instances E₁, ..., E_n, the following conditions shall hold:

   1. If n = 1, E₁ shall be a loop such that its start and end <Feature Node> instances are the same <Feature Node> instance.

   2. If n > 1, for each E_i, E_i+1, where i = 1, ..., n-1, E_i and E_i+1 shall associate to a common <Feature Node> instance, and where i = n, E₁ and E_n shall associate to a common <Feature Node> instance. For each consecutive <Feature Edge> instance within R, the <Edge Direction> link object shall be consistent with the starting and ending nodes of the edge.

   3. If n > 1, for each E_i, E_i+1, where i = 1, ..., n, there shall be at most one E_j, where j ≠ 1, such that E_j is the same <Feature Edge> instance as E_i but where the <Edge Direction> link objects for E_i and E_j have different forwards field values. If such an E_j exists, then, for every E_i, there shall be such an E_j.

2. For a <Geometry Face> instance F that associates to <Geometry Edge> instances E₁, ..., E_n, the following conditions shall hold:

   1. For each E_i, E_i+1, where i = 1, ..., n-1, E_i and E_i+1 shall associate to a common <Geometry Node> instance, and where i = n, E₁ and E_n shall associate to a common <Geometry Node> instance. For each consecutive <Geometry Edge> instance within F, the <Edge Direction> link object shall be consistent with the starting and ending nodes of the edge.

   2. A <Geometry Edge> instance shall appear no more than once in F with any orientation.

Rationale

Replicated information shall be consistent.

Example

No example supplied.

FAQs

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