System.Xml.Schema.NamespaceList.Union C# (CSharp) Méthode

        public static NamespaceList Union(NamespaceList o1, NamespaceList o2, bool v1Compat) {
            NamespaceList nslist = null;
            Debug.Assert(o1 != o2);
            if (o1.type == ListType.Any) { //clause 2 - o1 is Any
                nslist = new NamespaceList();
            }
            else if (o2.type == ListType.Any) { //clause 2 - o2 is Any
                nslist = new NamespaceList();
            }
            else if (o1.type == ListType.Set && o2.type == ListType.Set) { //clause 3 , both are sets
                nslist = o1.Clone();
                foreach (string ns in o2.set.Keys) {
                    nslist.set[ns] = ns;
                }
            }
            else if (o1.type == ListType.Other && o2.type == ListType.Other) { //clause 4, both are negations
                if (o1.targetNamespace == o2.targetNamespace) { //negation of same value
                    nslist = o1.Clone();
                }
                else {
                    nslist = new NamespaceList("##other", string.Empty); //clause 4, negations of different values, result is not(absent)
                }
            }
            else if (o1.type == ListType.Set && o2.type == ListType.Other) {
                if (v1Compat) {
                    if (o1.set.Contains(o2.targetNamespace)) {
                        nslist = new NamespaceList();
                    }
                    else { //This was not there originally in V1, added for consistency since its not breaking
                        nslist = o2.Clone();
                    }
                }
                else {
                    if (o2.targetNamespace != string.Empty) { //clause 5, o1 is set S, o2 is not(tns)
                        nslist = o1.CompareSetToOther(o2); 
                    }
                    else if (o1.set.Contains(string.Empty)) { //clause 6.1 - set S includes absent, o2 is not(absent) 
                        nslist = new NamespaceList();
                    }
                    else { //clause 6.2 - set S does not include absent, result is not(absent)
                        nslist = new NamespaceList("##other", string.Empty);
                    }
                }
            }
            else if (o2.type == ListType.Set && o1.type == ListType.Other) {
                if (v1Compat) {
                    if (o2.set.Contains(o2.targetNamespace)) {
                        nslist = new NamespaceList();
                    }
                    else {
                        nslist = o1.Clone();
                    }
                }
                else { //New rules
                    if (o1.targetNamespace != string.Empty) { //clause 5, o1 is set S, o2 is not(tns)
                        nslist = o2.CompareSetToOther(o1); 
                    }
                    else if (o2.set.Contains(string.Empty)) { //clause 6.1 - set S includes absent, o2 is not(absent) 
                        nslist = new NamespaceList();
                    }
                    else { //clause 6.2 - set S does not include absent, result is not(absent)
                        nslist = new NamespaceList("##other", string.Empty);
                    }
                }
            }
            return nslist;
        }

        internal static XmlSchemaAnyAttribute Union(XmlSchemaAnyAttribute o1, XmlSchemaAnyAttribute o2)
        {
            NamespaceList nsl = NamespaceList.Union(o1.NamespaceList, o2.NamespaceList);

            if (nsl != null)
            {
                XmlSchemaAnyAttribute anyAttribute = new XmlSchemaAnyAttribute();
                anyAttribute.namespaceList   = nsl;
                anyAttribute.processContents = o1.processContents;
                anyAttribute.Annotation      = o1.Annotation;
                return(anyAttribute);
            }
            else
            {
                // not expressible
                return(null);
            }
        }