<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<root>
	<return>
		<requestid>1</requestid>
		<requestdate>2016-01-01T00:00:00.000+02:00</requestdate>
		<requeststatus>ok</requeststatus>
		......
		куча служебной информации
		......
		<doc>
			<item>
				<doctype>indoc</doctype>
				<docid>1</docid>
				<docnum>1</docnum>
				<docdate>2016-01-01T00:00:00.000+02:00</docdate>
				<docperson>имя</docperson>
				<docstatus>new</docstatus>
				<docitem>
					<itemid>1</itemid>
					<itemnum>1</itemidnum>
					<itemname>название элемента</itemname>
					<itemamount>100</itemamount>
				</docitem>
			</item>
		</doc>
	</return>
</root>

@XmlRootElement(name = "doc")
public class Doc {
    List<Docs> item;

    public List<Docs> getItem() {
        return item;
    }
    @XmlElement(name = "item")
    public void setItem(List<Docs> item) {
        this.item = item;
    }
}

@XmlRootElement(name = "item")
public class Docs {
String type;
    String doctype;
    String docid;
    String docnum;
........................
    List<DocsItem> items;
    get
    set
}

@XmlRootElement(name = "docitem")
public class docitem {
String storeName;
    String itemid;
    String itemnum;
    String itemname;
    String itemamount;
    get
    set
}