src/main/java/com/amazonaws/services/neptune/propertygraph/io/JsonPropertyGraphPrinter.java [89:104]:
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            for (Map.Entry<?, ?> property : properties.entrySet()) {

                Object key = property.getKey();

                if (!labelSchema.containsProperty(key)) {

                    Object value = property.getValue();

                    PropertySchema propertySchema = new PropertySchema(key);
                    PropertySchema.PropertyValueMetadata propertyValueMetadata = propertySchema.accept(value, true);
                    if (isNullable) {
                        propertySchema.makeNullable();
                    }

                    labelSchema.put(key, propertySchema);
                    labelSchema.recordObservation(propertySchema, value, propertyValueMetadata);
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src/main/java/com/amazonaws/services/neptune/propertygraph/io/VariableRowCsvPropertyGraphPrinter.java [77:92]:
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        for (Map.Entry<?, ?> property : properties.entrySet()) {

            Object key = property.getKey();

            if (!labelSchema.containsProperty(key)) {

                Object value = property.getValue();

                PropertySchema propertySchema = new PropertySchema(key);
                PropertySchema.PropertyValueMetadata propertyValueMetadata = propertySchema.accept(value, true);
                if (isNullable) {
                    propertySchema.makeNullable();
                }

                labelSchema.put(key, propertySchema);
                labelSchema.recordObservation(propertySchema, value, propertyValueMetadata);
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