Is it possible to get a value removed from an attribute during the
current operation into a variable somehow?

For example, if i am processing something like:

<modify-attr attr-name="ugaIDNumber">
<value type="string">810000001</value>
<modify-attr attr-name="ugaIDNumber">
<value type="string">810000005</value>

is there any way to get the removed value of 810000001 into a variable
so I can do something with it later in the operation?

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