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How about including an identifier for the related resource? I would think
you would always want to give a reference to the related description in
these cases.

Rebecca

On Thu, 8 Jan 2004, Andrew E Switala wrote:

> Hi MODS folks,
>
> A related entry may have its own record in a MODS infoset, so that the
> <relatedItem> element referring to it needs no content, or at most
> <part> elements.  For example, a record for a journal article might have
> the subelement...
>
> <relatedItem type="host" xlink:href="#issn0000-0000">
>     <part>
>         <detail type="volume">5</detail>
>         <extent unit="pages">
>             <start>5</start>
>             <end>50</end>
>         </extent>
>     </part>
> </relatedItem>
>
> ...where the journal title, publication information, etc would be
> understood to come from the <mods> record in the same file with
> attribute ID="issn0000-0000".
>
> Since <relatedItem> is derived from <mods>, however, the example is not
> schema valid (because <mods> has to have at least one top-level
> subelement).  I've been using an empty <note/> element as filler, but
> perhaps the content model of <relatedItem> could be changed.  One way is
> to put the content of <mods> in a group and define both <mods> and
> <relatedItem> in terms of this group (example below), but then the
> "is-a" relationship of <relatedItem> to <mods> is lost.  I'm not enough
> of a schema hacker to know if there's a better approach.
>
> --Andy
>
>         <xsd:group name="modsContent">
>                 <xsd:choice>
>                         <xsd:element ref="titleInfo"/>
>                         <xsd:element ref="name"/>
>                         <xsd:element ref="typeOfResource"/>
>                         <xsd:element ref="genre"/>
>                         <xsd:element ref="originInfo"/>
>                         <xsd:element ref="language"/>
>                         <xsd:element ref="physicalDescription"/>
>                         <xsd:element ref="abstract">
>                                 <xsd:annotation>
>                                         <xsd:documentation>520</xsd:documentation>
>                                 </xsd:annotation>
>                         </xsd:element>
>                         <xsd:element ref="tableOfContents">
>                                 <xsd:annotation>
>                                         <xsd:documentation>505</xsd:documentation>
>                                 </xsd:annotation>
>                         </xsd:element>
>                         <xsd:element ref="targetAudience"/>
>                         <xsd:element ref="note"/>
>                         <xsd:element ref="subject"/>
>                         <xsd:element ref="classification"/>
>                         <xsd:element ref="relatedItem"/>
>                         <xsd:element ref="identifier"/>
>                         <xsd:element ref="location">
>                                 <xsd:annotation>
>                                         <xsd:documentation>852 $a $b $j
> $e</xsd:documentation>
>                                 </xsd:annotation>
>                         </xsd:element>
>                         <xsd:element ref="accessCondition">
>                                 <xsd:annotation>
>                                         <xsd:documentation>506,
> 540</xsd:documentation>
>                                 </xsd:annotation>
>                         </xsd:element>
>                         <xsd:element name="extension"
> type="extensionType"/>
>                         <xsd:element ref="recordInfo"/>
>                 </xsd:choice>
>         </xsd:group>
>
>         <xsd:complexType name="modsType">
>                 <xsd:group ref="modsContent" maxOccurs="unbounded"/>
>                 <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
>                 <xsd:attribute name="version">
>                         <xsd:simpleType>
>                                 <xsd:restriction base="xsd:string">
>                                         <xsd:enumeration value="3.0"/>
>                                 </xsd:restriction>
>                         </xsd:simpleType>
>                 </xsd:attribute>
>         </xsd:complexType>
>
>         <xsd:complexType name="relatedItemType">
>                 <xsd:sequence>
>                         <xsd:group ref="modsContent" minOccurs="0"
> maxOccurs="unbounded"/>
>                         <xsd:element name="part" type="partType"
> minOccurs="0" maxOccurs="unbounded"/>
>                 </xsd:sequence>
>                 <!-- Attributes omitted for clarity -->
>         </xsd:complexType>
>