xmlschema-core/src/main/java/org/apache/ws/commons/schema/XmlSchema.java [721:732]:
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                for (XmlSchemaExternal item : externals) {

                    XmlSchema schema = getSchema(item);

                    if (schema != null) {
                        // create an empty stack - push the current parent in
                        // and
                        // use the protected method to process the schema
                        if (schemaStack == null) {
                            schemaStack = new Stack<XmlSchema>();
                        }
                        schemaStack.push(this);
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xmlschema-core/src/main/java/org/apache/ws/commons/schema/XmlSchema.java [757:768]:
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                for (XmlSchemaExternal item : externals) {

                    XmlSchema schema = getSchema(item);

                    if (schema != null) {
                        // create an empty stack - push the current parent in
                        // and
                        // use the protected method to process the schema
                        if (schemaStack == null) {
                            schemaStack = new Stack<XmlSchema>();
                        }
                        schemaStack.push(this);
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