This is the archive of the goodrelations dicussion list

Dear all:

Please keep in mind that there are two different GoodRelations 
properties that refer to quantities of items:

a) gr:amountOfThisGood and
b) gr:hasInventoryLevel

gr:amountOfThisGood is attached to gr:TypeAndQuantity nodes and 
indicates the quantity of the item included in the particular offer. In 
80% of the cases, this should be 1.0 ("1.0"^^xsd.float), because the 
price etc. is for one item. A value other than 1.0 is appropriate when 
you sell a bundle of items or use units of measurement other than 
"item/piece", e.g. selling

"100 tiles"
"500 g of butter", or
"1 camera + 2 memory sticks"

gr:hasInventoryLevel, on the contrary, can be used to indicate inventory 
levels. While gr:amountOfThisGood is an owl:DatatypeProperty, 
gr:hasInventoryLevel  is an owl:ObjectProperty with a range of 
gr:QuantitativeValueFloat, because this allows for using arbitrary units 
and also specifying ranges.

It can only be attached to instances of 
gr:ProductOrServicesSomeInstancesPlaceholder.

So if you want to indicate inventory levels, use gr: hasInventoryLevel 
in combination with an instance of gr:QuantitativeValueFloat.

*Example:* Assume you have 80 pieces of this controller card on stock. 
Then, use the following pattern:

*_N3:_*

foo:myProduct a gr:ProductOrServicesSomeInstancesPlaceholder;
   rdfs:label "Personal SCSI 16-bit SCSI Controller"@en ;
   gr:hasEAN_UCC-13 "00010363780"^^xsd:string ;
   gr:hasManufacturer 
<http://www.heppnetz.de/searchmonkey/product.html#heppcomputer> ;
   rdfs:comment "This low-cost, high-performance SCSI controller allows 
you to connect up to seven professional mass-storage devices to your 
computer."@en ;
   rdfs:seeAlso <http://www.heppnetz.de/searchmonkey/product.html>, 
<http://www.heppnetz.de/searchmonkey/pscsi.jpg> ;
   foaf:depiction <http://www.heppnetz.de/searchmonkey/pscsi.jpg> ;
*   gr:hasInventoryLevel
       [ a gr:QuantitativeValueFoat;
         gr:hasValueFloat "80"^^xsd:float ;
         gr:hasUnitOfMeasurement "C62"^^xsd:string
       ] ;*
.

RDFa:

<div typeof="gr:ProductOrServicesSomeInstancesPlaceholder" 
about="#myProduct">
     Product Name:
     <span property="rdfs:label">Personal SCSI 16-bit SCSI Controller</span>
     <br/>Description:
     <span property="rdfs:comment">This low-cost, high-performance SCSI 
controller allows you to connect up to
     seven professional mass-storage devices to your computer.</span><br/>
     EAN/UPC code:
     <span property="gr:hasEAN_UCC-13" 
datatype="xsd:string">00010363780</span><br/>
     <span rel="rdfs:seeAlso media:image foaf:depiction">
          <img src="http://www.heppnetz.de/searchmonkey/pscsi.jpg" 
alt="Product Image"/>
     </span>
*     <span rel="gr:hasInventoryLevel>
          <span typeof="gr:QuantitativeValueFoat>
               <span property="gr:hasValueFloat" 
datatype="xsd:float">80</span> items on stock.
                <span property="hasUnitOfMeasurement" 
datatype="xsd:string" content="C62"/>
          </span>
    </span>*
</div>


Best

Martin Hepp

-- 
--------------------------------------------------------------
martin hepp
e-business & web science research group
universitaet der bundeswehr muenchen

e-mail:  mhepp at computer.org
phone:   +49-(0)89-6004-4217
fax:     +49-(0)89-6004-4620
www:     http://www.unibw.de/ebusiness/ (group)
         http://www.heppnetz.de/ (personal)
skype:   mfhepp 
twitter: mfhepp

Check out GoodRelations for E-Commerce on the Web of Linked Data!
=================================================================

Webcast:
http://www.heppnetz.de/projects/goodrelations/webcast/

Recipe for Yahoo SearcMonkey:
http://tr.im/rAbN

Talk at the Semantic Technology Conference 2009: 
"Semantic Web-based E-Commerce: The GoodRelations Ontology"
http://tinyurl.com/semtech-hepp

Overview article on Semantic Universe:
http://tinyurl.com/goodrelations-universe

Project page:
http://purl.org/goodrelations/

Resources for developers:
http://www.ebusiness-unibw.org/wiki/GoodRelations

Tutorial materials:
CEC'09 2009 Tutorial: The Web of Data for E-Commerce: A Hands-on Introduction to the GoodRelations Ontology, RDFa, and Yahoo! SearchMonkey 
http://tr.im/grcec09

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