System.Xml.Schema.XdrBuilder.XDR_BeginAttribute C# (CSharp) Method

        private static void XDR_BeginAttribute(XdrBuilder builder)
        {
            if (builder._BaseDecl._TypeName.IsEmpty)
            {
                builder.SendValidationEvent(SR.Sch_MissAttribute);
            }

            SchemaAttDef attdef = null;
            XmlQualifiedName qname = builder._BaseDecl._TypeName;
            string prefix = builder._BaseDecl._Prefix;

            // local?
            if (builder._ElementDef._AttDefList != null)
            {
                attdef = (SchemaAttDef)builder._ElementDef._AttDefList[qname];
            }

            // global?
            if (attdef == null)
            {
                // if there is no URN in this name then the name is local to the
                // schema, but the global attribute was still URN qualified, so
                // we need to qualify this name now.
                XmlQualifiedName gname = qname;
                if (prefix.Length == 0)
                    gname = new XmlQualifiedName(qname.Name, builder._TargetNamespace);
                SchemaAttDef ad;
                if (builder._SchemaInfo.AttributeDecls.TryGetValue(gname, out ad))
                {
                    attdef = (SchemaAttDef)ad.Clone();
                    attdef.Name = qname;
                }
                else if (prefix.Length != 0)
                {
                    builder.SendValidationEvent(SR.Sch_UndeclaredAttribute, XmlQualifiedName.ToString(qname.Name, prefix));
                }
            }

            if (attdef != null)
            {
                builder.XDR_CheckAttributeDefault(builder._BaseDecl, attdef);
            }
            else
            {
                // will process undeclared types later
                attdef = new SchemaAttDef(qname, prefix);
                DeclBaseInfo decl = new DeclBaseInfo();
                decl._Checking = true;
                decl._Attdef = attdef;
                decl._TypeName = builder._BaseDecl._TypeName;
                decl._ElementDecl = builder._ElementDef._ElementDecl;
                decl._MinOccurs = builder._BaseDecl._MinOccurs;
                decl._Default = builder._BaseDecl._Default;

                // add undefined attribute types
                decl._Next = builder._UndefinedAttributeTypes;
                builder._UndefinedAttributeTypes = decl;
            }

            builder._ElementDef._ElementDecl.AddAttDef(attdef);
        }