class XMLSeq<RawProduct>(val reader: XMLStreamReader) : Sequence<RawProduct> {
    override fun iterator() = object : Iterator<RawProduct> {
        override fun hasNext() = reader.hasNext()
​
        override fun next(): RawProduct {
            var item: RawProduct? = null
            while (item == null) {
                if (reader.next() == XMLStreamReader.START_ELEMENT && reader.name.toString() == "item")
                    item = xmlMapper.streamValue<Map<String, Any>>(reader).filter { it.value is String } as RawProduct
            }
            return item
        }
​
        private inline fun <reified T> XmlMapper.streamValue(reader: XMLStreamReader): T =
            this.readValue(reader, jacksonTypeRef<T>())
​
        private val xmlMapper = XmlMapper(
            JacksonXmlModule().apply {
                setDefaultUseWrapper(false)
            }).registerKotlinModule()
            .configure(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES, true)
            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false) as XmlMapper
    }
​
    companion object {
        fun <A> from(stream: InputStream): XMLSeq<A> {
            val reader = XMLInputFactory.newFactory().createXMLStreamReader(stream)
            return XMLSeq(reader)
        }
    }