XQuery 1.0/2.0: Group Elements by Changing Attribute (Alternative to XQuery 3.0: Tumbling Window)

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I'm trying to group Elements via changing attributes, this could be easily done with XQuery 3.0 Tumbling Windows, but I'm limited to XQuery 2.0.

The input looks like following:

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <value attr="a" no="1"/>
    <value attr="a" no="2"/>
    <value attr="b"/>
    <value attr="a" no="3"/>
    <value attr="b"/>
    <value attr="b"/>
    <value attr="a" no="4"/>
    <value attr="a" no="5"/>
    <value attr="b"/>
    <value attr="a" no="6"/> 
</root>

The required output is the following:

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <new>
        <value attr="a" no="1"/>
        <value attr="a" no="2"/>
    </new>
    <new>
        <value attr="a" no="3"/>
    </new>
    <new>
        <value attr="a" no="4"/>
        <value attr="a" no="5"/>
    </new>
    <new>
        <value attr="a" no="6"/>
    </new>
</root>

asked 49 secs ago

user3770728

1