Preserve previous value and actual value of for each on data mapping

Summary:

Content (please ensure you mask any confidential information):

Hi experts,

I am working on an OIC integration where I must have a for each in the data mapping.
In the loop I must show the value of the previous iteration and the value of the current iteration similar of this:

Input:

• P00001
• P00002
• P00003
• P00004
• P00005

expected output:

iteration 1:

last_value = '' and curr_value = P00001

iteration 2:

last_value = P00001 and curr_value P00002

iteration 3:

last_value = P00002 and curr_value P00003

……

….

I tried to do creating variables in the mapping as follows:

<ns16:response-wrapper xml:id="id_42">

  <xsl:for-each select="/nstrgmpr:execute/ns16:request-wrapper/ns16:paradas">