mods and hierarchical sujbects

Turns out the MARC/MODS subject structure is more flexible/complex than 
I'd realized.  Here's a record I just coded:

<?xml version="1.0" encoding="utf-8"?>
<modsCollection xmlns="http://www.loc.gov/mods/v3">
   <mods ID="Tilly2000a">
     <name type="personal">
       <namePart type="given">Charles</namePart>
       <namePart type="family">Tilly</namePart>
       <role>
         <roleTerm type="text">reviewer</roleTerm>
       </role>
     </name>
     <titleInfo>
       <title>Review of Moral Economy and Popular Protest</title>
     </titleInfo>
     <subject>
       <topic>riots</topic>
       <name type="personal">
	<namePart type="given">Edward</namePart>
	<namePart type="given">P.</namePart>
	<namePart type="family">Thompson</namePart>
       </name>
       <titleInfo>
	<title>Moral Economy and Popular Protest</title>
	<subTitle>Crowds, Conflict and Authority</subTitle>
       </titleInfo>
       <name type="personal">
	<namePart type="given">Adrian</namePart>
	<namePart type="family">Randall</namePart>
	<role>
	  <roleTerm type="text">editor</roleTerm>
	</role>
       </name>
       <name type="personal">
	<namePart type="given">Andrew</namePart>
	<namePart type="family">Charlesworth</namePart>
	<role>
	  <roleTerm type="text">editor</roleTerm>
	</role>
       </name>
     </subject>
     <genre>review</genre>
     <relatedItem type="host">
       <titleInfo>
	<title>Journal of Interdisciplinary History</title>
       </titleInfo>
       <typeOfResource>text</typeOfResource>
       <originInfo>
	<dateIssued>2000</dateIssued>
       	<issuance>continuing</issuance>
       </originInfo>
       <genre>periodical</genre>
       <part>
         <detail type="volume"><number>31</number></detail>
         <detail type="issue"><number>2</number></detail>
	<extent unit="page">
           <start>259</start>
           <end>260</end>
	</extent>
       </part>
     </relatedItem>
     <recordInfo>
       <recordCreationDate 
encoding="w3cdtf">2003-12-11</recordCreationDate>
       <recordIdentifier source="citekey">Tilly2000a</recordIdentifier>
     </recordInfo>
   </mods>
</modsCollection>



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