xmlschema-walker/src/main/java/org/apache/ws/commons/schema/walker/XmlSchemaWalker.java [457:462]:
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                if (item instanceof XmlSchemaGroup) {
                    children.add(((XmlSchemaGroup)item).getParticle());
                } else if (item instanceof XmlSchemaParticle) {
                    children.add((XmlSchemaParticle)item);
                } else {
                    throw new IllegalArgumentException(
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xmlschema-walker/src/main/java/org/apache/ws/commons/schema/walker/XmlSchemaWalker.java [471:476]:
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                if (item instanceof XmlSchemaGroup) {
                    children.add(((XmlSchemaGroup)item).getParticle());
                } else if (item instanceof XmlSchemaParticle) {
                    children.add((XmlSchemaParticle)item);
                } else {
                    throw new IllegalArgumentException(
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