Do you know the name of this format?

A library software provides an export option for each data item. The output format is as follows. Do you know the name of this format? Is it a standard format?

<?xml version="1.0" encoding="UTF-8"?>
<ISO>
    <tag1>4506</tag1>  
    <tag5>Constitutional reform</tag5>  
    <tag6>the Labour government's constitutional reform agenda</tag6>  
    <tag7>edited by Robert Blackburn and Raymond Plant</tag7>  
    <tag14>^aLondon ; New York^bLongman^c,1999</tag14>  
    <tag16>xiii, 517 p. 24 cm.</tag16>  
    <tag24>Includes bibliographical references and index.</tag24>  
    <tag25>KD^d1999^c.C659^n3989</tag25>  
    <tag32>^i1^jT</tag32>  
    <tag33>0582369991</tag33>  
    <tag37>BL</tag37>  
    <tag44>Constitutional law- Great Britain</tag44>  
    <tag57>^h2676^eی‌س‍ی‍ل‍گ‍ن‍ا^kع‌ج‍رم‍ری‍غ‍^r0^c1^v0^b000^n1383/03/19^f1</tag57>

PHPst

• citations

Comments

• Martin Schröder: See http://forums.zotero.org/discussion/28127/iso-format/
• Robert Cartaino: @Martin, Why don't you flesh that out a bit and post it as an answer, because you are essentially correct?
• Martin Schröder: @RobertCartaino: It's the same question - I leave that to the poster.
• anarchivist: Which library software exports this format?