带有嵌套的Postgresql xpath无法使元素保持正确的顺序

Question

我在尝试从postgres中的xml字段提取值时遇到问题。我需要确保嵌套元素与它们所属的行保持一致，但似乎并没有这样做。

作为一个例子，我有这个的XML ...

    <sample>
        <top>
        <header><valuea>a</valuea><valueb>b</valueb></header>
            <node_a>
            <person>
                <person_name>John Doe</person_name>
                <note>this is a note</note>
                <address>
                    <street>100 Main St</street>
                    <city>AnyTown</city>
                    <state>CA</state>
                    <zip>99999</zip>
                    <note>Beware of the dog</note>
                </address>
                <node_b>
                    <likes>
                        <item>
                            <desc>walks on the beach</desc>
                            <note>only at sunset</note>
                        </item>
                        <item>
                            <desc>spring showers</desc>
                            <note>bring may flowers</note>
                        </item>
                    </likes>
                </node_b>
                </person>
                <person>
                <person_name>Jane Doe</person_name>
                <note>madame is a true lady</note>
                <address>
                    <street>100 Main St</street>
                    <city>AnyTown</city>
                    <state>CA</state>
                    <zip>99999</zip>
                    <note>Hell hath no fury</note>
                </address>
                <node_b>
                    <likes>
                        <item>
                            <desc>wine</desc>
                            <note>only red</note>
                        </item>
                        <item>
                            <desc>nachos</desc>
                            <note>by candle light</note>
                        </item>
                    </likes>
                </node_b>
                
                </person>
            </node_a>
        </top>
    </sample>

sql

SELECT btrim(xpath('//top/header/valuea/text()', xml)::text, '{}') as value_a,
btrim(xpath('//top/header/valueb/text()', xml)::text, '{}') as value_b,
unnest(xpath('//node_a/person/person_name/text()', xml)::text[]) AS person_name,
unnest(xpath('//node_a/person/note/text()', xml)::text[]) AS note,
unnest(xpath('//node_b/likes/item/desc/text()', xml)::text[]) AS likes_desc,
unnest(xpath('//node_b/likes/item/note/text()', xml)::text[]) AS likes_note

    FROM
        inbox AS t
    where repoid=4

产生此结果

简·多伊（Jane Doe）应该在第3行，而不是第2行。

关于如何调整sql以确保notes部分保持正确水平的任何想法吗？