System.Xml.Schema.ParticleContentValidator.CheckUniqueParticleAttribution C# (CSharp) Method

        private void CheckUniqueParticleAttribution(BitSet curpos) {
            // particles will be attributed uniquely if the same symbol never poins to two different ones
            object[] particles = new object[symbols.Count]; 
            for (int pos = curpos.NextSet(-1); pos != -1; pos = curpos.NextSet(pos)) {
                // if position can follow
                int symbol = positions[pos].symbol;
                if (particles[symbol] == null) {
                    // set particle for the symbol
                    particles[symbol] = positions[pos].particle;
                }
                else if (particles[symbol] != positions[pos].particle) {
                    throw new UpaException(particles[symbol], positions[pos].particle);
                }
                // two different position point to the same symbol and particle - that's OK
            }
        }