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MODS  October 2006

MODS October 2006

Subject:

Re: How to encode number of Illustrations/Tables/References in MODS?

From:

Karen Coyle <[log in to unmask]>

Reply-To:

Metadata Object Description Schema List <[log in to unmask]>

Date:

Mon, 30 Oct 2006 06:09:31 -0800

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (137 lines)

As for defining "extent" as "extentType" in the physical description 
area, note that extentType is very specifically about page numbers and 
ranges, not extents in general. It has elements:
   start
   end
   total
   list
and the examples are all about page numbers. So extentType really is 
pageExtentType, and perhaps a more general extentType is needed (not 
that I'm saying they have to have those names, I mean that conceptually).

kc

Jakob Voss wrote:
> Rebecca S. Guenther wrote:
>
>   
>> Generally number of illustrations and number of tables would go under
>> <physicalDescription><extent>. The extent element is just a string at this
>> point. 
>>     
>
> ..
>
>   
>> We will also want to look at the definition of <extent> under <part>,
>> which does have some structure (and an attribute "unit"). However,
>> using <part> in your situation isn't appropriate, since you're talking
>> about the whole and not a part.
>>
>> We will need to have a full discussion of this, which would result in a
>> fairly extensive change to MODS. In the meantime, what you suggest won't
>> work, since there is no unit attribute associated with <extent>, so it
>> wouldn't validate.  (You mentioned using <extend>, but that is not a valid
>> MODS element. I think you must have meant <extent>.)
>>     
>
> But in http://www.loc.gov/standards/mods/v3/mods-3-2-outline.html#part
> it is noted that <extent> has a "unit" attribute. Letting <extent> have
> a unit attribut in one place and no unit attribut at another is simply
> bad design. You just have to change the definition of <extent> under
> <physicalDescription> from
>
> <xsd:element name="extent" type="xsd:string"/>
>
> to
>
> <xsd:element name="extent" type="extentType"/>
>
> like it is defined under <part>.
>
> An article of 12 pages in a journal of 90 pages should be expressed as:
>
> <mods>
>   <titleInfo><title>ARTICLE</title></titleInfo>
>   <extent unit="page">
>     <number>12</number>
>   </extent>
>   <relatedItem type="host">
>     <titleInfo><title>JOURNAL</title></titleInfo>
>     <extent unit="page">
>       <number>90</number>
>     </extent>
>   </relatedItem>
> </mods>
>
>   
>> So in the meantime, if you need this sort of thing you could put something
>> structured in <extension> which allows for local elements. And someone
>> could put forth a proposal to enhance <extent> for this sort of structure
>> in the next version.
>>     
>
> Well, until this is fixed in the next version of MODS I better use:
>
> <physicalDescription>
>   <extent>12 p.</extent>
>   <extent>5 fig.</extent>
>   <extent>3 tab.</extent>
> </physicalDescription>
>
> You can transform the old syntax to the new with:
>
>
> <xsl:template match="extent">
>   <xsl:variable name="unit"
>   select="substring(substring-after(normalize-space(.),' '),1,1)"/>
>   <xsl:variable name="value"
>   select="substring-before(normalize-space(.),' '))"/>
>
>   <extent>
>    <number>
>     <xsl:choose>
>       <xsl:when test="$unit = 'p'">
>         <xsl:attribute name="unit">page</xsl:attribute>
>         <xsl:value-of select="$value"/>
>       </xsl:when>
>       <xsl:when test="$unit = 't'">
>         <xsl:attribute name="unit">table</xsl:attribute>
>         <xsl:value-of select="$value"/>
>       </xsl:when>
>       <xsl:when test="$unit = 'f' or $unit = 'i'">
>         <xsl:attribute name="unit">figure</xsl:attribute>
>         <xsl:value-of select="$value"/>
>       </xsl:when>
>       <xsl:otherwise>
>          <xsl:value-of select="."/>
>       </xsl:otherwise>
>     </xsl:choose>
>    </number>
>   </extent>
> </xsl:template>
>
>
>   
>> And someone could put forth a proposal to enhance <extent> for this
>> sort of structure in the next version.
>>     
>
> Ok. Hereby I declare this a proposal to enhance <extent> in the next
> version of MODS. :-)
>
> Greetings,
> Jakob
>
>
>   

-- 
-----------------------------------
Karen Coyle / Digital Library Consultant
[log in to unmask] http://www.kcoyle.net
ph.: 510-540-7596
fx.: 510-848-3913
mo.: 510-435-8234
------------------------------------

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