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Two ontologies have been identified as potential candidates for representing a list of items. The pros and cons are listed below for each ontology, followed by examples using each ontology.

co	.List Collections ontology	ore	.Aggregation ORE ontology
–	unordered and ordered collections are represented by two separate class constructs, Bag and List respectively	+	unordered unordered and ordered collections are represented by the same class construct, Aggregation
+	item property names are easy to understand (e.g., index, itemContent, nextItem)	–	item item property names are cryptic (e.g., proxyFor, proxyIn, next)
–	order order is determined by an item property pointing to the next item, i.e., nextItem	–	order order is determined by an item property pointing to the next item, i.e., next

Example 1: A Virtual Collection as a Collection Ontology's List with one Item

–	URI for the item is not associated with the collection class (e.g., List, Bag).	+	URI for the item is associated with the collection class (i.e., Aggregation) via of the aggregates property.
+	URI for the item is associated with the item class (i.e., Item) via the itemContent property.	+	URI for the item is associated with the item class (i.e., Proxy) via the proxyFor property.

Example 1-co: A Virtual Collection as an ordered collection of items using Collection Ontology's List with one item

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title	Expand to see n-triples...

Code Block

language	none
title	n-triples

<http://localhost:3000/individual/vc155> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/co#List>
<http://localhost:3000/individual/vc155> <http://purl.org/co#size> "1"^^xsd:nonNegativeInteger
<http://localhost:3000/individual/vc155> <http://purl.org/co#firstItem> <http://localhost:3000/individual/vci162>
<http://localhost:3000/individual/vc155> <http://purl.org/co#item> <http://localhost:3000/individual/vci162>
<http://localhost:3000/individual/vc155> <http://purl.org/co#lastItem> <http://localhost:3000/individual/vci162>

<http://localhost:3000/individual/vci162> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/co#ListItem>
<http://localhost:3000/individual/vci162> <http://purl.org/co#index> "1"^^xsd:positiveInteger
<http://localhost:3000/individual/vci162> <http://purl.org/co#itemContent> <http://da-rdf.library.cornell.edu/individual/b3652730>

Code Block

title	Turtle using Collection ontology's List class

@prefix rdf:     <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix co:      <http://purl.org/co> .
 
<http://localhost:3000/individual/vc155> a co:List ;
  co:size       "1"^^xsd:nonNegativeInteger ;
  co:firstItem  <http://localhost:3000/individual/vci162> ;
  co:item       <http://localhost:3000/individual/vci162> ;
  co:lastItem   <http://localhost:3000/individual/vci162> .
 
<http://localhost:3000/individual/vci162> a co:ListItem
  co:index        "1"^^xsd:positiveInteger ;
  co:itemContent  <http://da-rdf.library.cornell.edu/individual/b3652730> .

Example 1-ore: A Virtual Collection as an ordered collection of items using ORE Ontology's Aggregation with one item

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title	Expand to see n-triples...

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title	n-triples

<http://localhost:3000/individual/vc155> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.openarchives.org/ore/terms/Aggregation>
<http://localhost:3000/individual/vc155> <http://www.openarchives.org/ore/terms/aggregates> <http://da-rdf.library.cornell.edu/individual/b3652730>

Code Block

title	Turtle using ORE ontology's Aggregation class

@prefix ore:     <http://www.openarchives.org/ore/terms/> .
  
<http://localhost:3000/individual/vc155> a ore:Aggregation ;
  ore:aggregates <http://da-rdf.library.cornell.edu/individual/b3652730> .

Example 2-co: A Virtual Collection as an ordered collection of items using Collection Ontology's List with multiple ordered items

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title	Expand to see n-triples...

Code Block

language	none
title	n-triples

<http://localhost:3000/individual/vc155> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/co#List>
<http://localhost:3000/individual/vc155> <http://purl.org/co#size> "4"^^xsd:nonNegativeInteger
<http://localhost:3000/individual/vc155> <http://purl.org/co#firstItem> <http://localhost:3000/individual/vci162>
<http://localhost:3000/individual/vc155> <http://purl.org/co#item> <http://localhost:3000/individual/vci162>
<http://localhost:3000/individual/vc155> <http://purl.org/co#item> <http://localhost:3000/individual/vci163>
<http://localhost:3000/individual/vc155> <http://purl.org/co#item> <http://localhost:3000/individual/vci164>
<http://localhost:3000/individual/vc155> <http://purl.org/co#item> <http://localhost:3000/individual/vci165>
<http://localhost:3000/individual/vc155> <http://purl.org/co#lastItem> <http://localhost:3000/individual/vci165>

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title	Expand to see n-triples...

Code Block

language	none
title	n-triples

<http://localhost:3000/individual/vc155>vci162> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/co#List>co#ListItem>
<http://localhost:3000/individual/vc155>vci162> <http://purl.org/co#size>co#index> "1"^^xsd:nonNegativeIntegerpositiveInteger
<http://localhost:3000/individual/vc155>vci162> <http://purl.org/co#firstItem>co#itemContent> <http://localhost:3000da-rdf.library.cornell.edu/individual/vci162>b3652730>
<http://localhost:3000/individual/vc155> <http://purl.org/co#item> <http://localhost:3000/individual/vci162>
<http://localhost:3000/individual/vc155> <http://purl.org/co#lastItem>co#nextItem> <http://localhost:3000/individual/vci162>vci163>

<http://localhost:3000/individual/vci162>vci163> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/co#ListItem>
<http://localhost:3000/individual/vci163> <http://purl.org/co#ListItem>/co#index> "2"^^xsd:positiveInteger
<http://localhost:3000/individual/vci163> <http://purl.org/co#itemContent> <http://da-rdf.library.cornell.edu/individual/b3652234>
<http://localhost:3000/individual/vci162>vci163> <http://purl.org/co#index> "1"^^xsd:positiveInteger
co#nextItem> <http://localhost:3000/individual/vci162> vci164>

<http://purl.org/co#itemContent> <http://da-rdf.library.cornell.edu/individual/b3652730>

Code Block

title	Turtle using Collection ontology's List class

@prefix rdf:

localhost:3000/individual/vci164> <http://www.w3.org/1999/02/22-rdf-syntax-

ns#>

ns#type> <http://purl.

@prefix co:

org/co#ListItem>
<http://localhost:3000/individual/vci164> <http://purl.org/

co> .

co#index> "3"^^xsd:positiveInteger
<http://localhost:3000/individual/

vc155>

vci164>

a co:List ; co:size "1"^^xsd:nonNegativeInteger ; co:firstItem

<http://purl.org/co#itemContent> <http://da-rdf.library.cornell.edu/individual/b3652543>
<http://localhost:3000/individual/

vci162> ; co:item

vci164> <http://purl.org/co#nextItem> <http://localhost:3000/individual/

vci162> ; co:lastItem

vci165>

<http://localhost:3000/individual/

vci162> .

vci165> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/co#ListItem>
<http://localhost:3000/individual/

vci162>

vci165>

a co:ListItem co:index "1

<http://purl.org/co#index> "4"^^xsd:positiveInteger

;

co:itemContent

<http://

da-rdf.library.cornell.edu

localhost:3000/individual/

b3652730>

vci165>

.

Example 2: A Virtual Collection as a List with multiple ordered Items

<http://purl.org/co#itemContent> <http://da-rdf.library.cornell.edu/individual/b3652884>

<http://localhost:3000/individual/vc155>

 <http://www.w3.org/1999/02/22

-rdf-syntax-ns#type>

-rdf-syntax-ns#> .
@prefix co:      <http://purl.org/

co#List>

co> .

<http://localhost:3000/individual/vc155> a co:List ;
  co:size       "4"^^xsd:nonNegativeInteger ;
  co:firstItem  <http://

purl.org/co#size> "4"^^xsd:nonNegativeInteger

localhost:3000/individual/vci162> ;
  co:item       <http://localhost:3000/individual/

vc155>

vci162> ;
  co:item       <http:/

/purl.org/co#firstItem>

/localhost:3000/individual/vci163> ;
  co:item       <http://localhost:3000/individual/

vci162>

vci164> ;
  co:item       <http://localhost:3000/individual/

vc155> <http://purl.org/co#item>

vci165> ;
  co:lastItem   <http://localhost:3000/individual/

vci162>

vci165> .
 
<http://localhost:3000/individual/

vc155>

vci162> a co:ListItem ;
  co:index        "1"^^xsd:positiveInteger ;
  co:itemContent  <http://

purl.org/co#item>

da-rdf.library.cornell.edu/individual/b3652730> ;
  co:nextItem     <http://localhost:3000/individual/vci163> .

<http://localhost:3000/individual/

vc155> <http://purl.org/co#item>

vci163> a co:ListItem ;
  co:index        "2"^^xsd:positiveInteger ;
  co:itemContent  <http://

localhost:3000

da-rdf.library.cornell.edu/individual/

vci164>

b3652234> ;
  co:nextItem     <http://localhost:3000/individual/

vc155>

vci164>

<http://purl.org/co#item>

.

<http://localhost:3000/individual/

vci165>

vci164> a co:ListItem ;
  co:index        "3"^^xsd:positiveInteger ;
  co:itemContent  <http://

localhost:3000

da-rdf.library.cornell.edu/individual/

vc155> <http://purl.org/co#lastItem>

b3652543> ;
  co:nextItem     <http://localhost:3000/individual/vci165> .

<http://localhost:3000/individual/

vci162>

vci165> a

<http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/co#ListItem> <http://localhost:3000/individual/vci162> <http://purl.org/co#index> "1

co:ListItem ;
  co:index        "4"^^xsd:positiveInteger ;
  co:itemContent  <http://

localhost:3000

da-rdf.library.cornell.edu/individual/

vci162>

b3652884> .

Code Block

title	Turtle using Collection ontology's List class

@prefix rdf:

Expand

title	Expand to see n-triples...

Code Block

language	none
title	n-triples

Example 2-ore: A Virtual Collection as an ordered collection of items using ORE Ontology's Aggregation with multiple ordered items

Expand

title	Expand to see n-triples...

Code Block

language	none
title	n-triples

<http://purl.org/co#itemContent> <http://da-rdf.library.cornell.edu/individual/b3652730>
<http://localhost:3000/individual/vci162>vc155> <http://purl.org/co#nextItem> <http://localhost:3000/individual/vci163>

<http://localhost:3000/individual/vci163> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.openarchives.org/ore/terms/purlAggregation> .org/co#ListItem>
<http://localhost:3000/individual/vci163>vc155> <http://purlwww.openarchives.org/co#index> "2"^^xsd:positiveIntegerore/terms/aggregates> <http://da-rdf.library.cornell.edu/individual/b3652730> .
<http://localhost:3000/individual/vci163>vc155> <http://purlwww.openarchives.org/co#itemContent>ore/terms/aggregates> <http://da-rdf.library.cornell.edu/individual/b3652234> .
<http://localhost:3000/individual/vci163>vc155> <http://purlwww.openarchives.org/ore/terms/co#nextItem>aggregates> <http://localhost:3000da-rdf.library.cornell.edu/individual/vci164>b3652543> .

<http://localhost:3000/individual/vci164>pxy162> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purlwww.openarchives.org/co#ListItem>/ore/terms/Proxy> .
<http://localhost:3000/individual/vci164>pxy162> <http://purlwww.openarchives.org/co#index> "3"^^xsd:positiveIntegerore/terms/proxyFor> <http://da-rdf.library.cornell.edu/individual/b3652730> .
<http://localhost:3000/individual/vci164>pxy162> <http://purlwww.openarchives.org/ore/terms/co#itemContent>proxyIn> <http://da-rdf.library.cornell.edu/localhost:3000/individual/b3652543>vc155> .
<http://localhost:3000/individual/vci164>pxy162> <http://purlwww.iana.org/assignments/co#nextItem>relation/next> <http://localhost:3000/individual/vci165>pxy163> .

<http://localhost:3000/individual/vci165>pxy163> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purlwww.openarchives.org/co#ListItem>/ore/terms/Proxy> .
<http://localhost:3000/individual/vci165>pxy163> <http://purlwww.openarchives.org/co#index> "4"^^xsd:positiveInteger
<http://localhost:3000/individual/vci165> <http://purl.org/co#itemContent>ore/terms/proxyFor> <http://da-rdf.library.cornell.edu/individual/b3652884>

Code Block

language	none
title	Turtle

@prefix rdf:

b3652234> .
<http://localhost:3000/individual/pxy163> <http://www.

w3

openarchives.org

/1999/02/22-rdf-syntax-ns#> . @prefix co:

/ore/terms/proxyIn> <http://localhost:3000/individual/vc155> .
<http://localhost:3000/individual/pxy163> <http://

purl

www.iana.org

/co>

/assignments/relation/next> <http://localhost:3000/individual/pxy164> .

<http://localhost:3000/individual/

vc155>

pxy164>

a co:List ; co:size "4"^^xsd:nonNegativeInteger ; co:firstItem

<http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.openarchives.org/ore/terms/Proxy> .
<http://localhost:3000/individual/

vci162> ; co:item

pxy164> <http:/

/localhost:3000/individual/vci162> ; co:item

/www.openarchives.org/ore/terms/proxyFor> <http://da-rdf.library.cornell.edu/individual/b3652543> .
<http://localhost:3000/individual/

vci163> ; co:item

pxy164> <http://www.openarchives.org/ore/terms/proxyIn> <http://localhost:3000/individual/

vci164>

vc155> .

Code Block

title	Turtle using ORE ontology's Aggregation class

@prefix ore:;
  co:item       <http://localhost:3000/individual/vci165> ;
  co:lastItem<http://www.openarchives.org/ore/terms/> .
@prefix iana:    <http:///localhost:3000/individual/vci165>www.iana.org/assignments/relation/> .
 
<http://localhost:3000/individual/vci162>vc155> a coore:ListItemAggregation ;
  coore:index        "1"^^xsd:positiveIntegeraggregates <http://da-rdf.library.cornell.edu/individual/b3652730> ;
  coore:itemContent aggregates <http://da-rdf.library.cornell.edu/individual/b3652730>b3652234> ;
  coore:nextItemaggregates     <http://localhost:3000da-rdf.library.cornell.edu/individual/vci163>b3652543> .
 
<http://localhost:3000/individual/vci163>pxy162> a coore:ListItemProxy ;
  coore:index        "2"^^xsd:positiveIntegerproxyFor <http://da-rdf.library.cornell.edu/individual/b3652730> ;
  coore:itemContentproxyIn  <http://da-rdf.library.cornell.edu/localhost:3000/individual/b3652234>vc155> ;
  coiana:nextItemnext     <http://localhost:3000/individual/vci164>pxy163> .
 
<http://localhost:3000/individual/vci164>pxy163> a coore:ListItemProxy ;
  coore:index        "3"^^xsd:positiveInteger ;
  co:itemContent  proxyFor <http://da-rdf.library.cornell.edu/individual/b3652543>b3652234> ;
  ore:proxyIn <http://localhost:3000/individual/vc155> ;
  coiana:nextItem next    <http://localhost:3000/individual/vci165>pxy164> .
 
<http://localhost:3000/individual/vci165>pxy164> a coore:ListItemProxy ;
  co:index        "4"^^xsd:positiveInteger ;
  co:itemContent  ore:proxyFor <http://da-rdf.library.cornell.edu/individual/b3652884>b3652543> ;
  ore:proxyIn <http://localhost:3000/individual/vc155> .

QUESTIONS:

Should Virtual Collection's type be a subclass of co:List instead of a co:List?
- If so, what is the type? Consensus: Subclass of co:List Ontology to be defined by ontology group.
- Is it LD4L specific? Consensus: YES to be defined by ontology group.
- How is LD4L defining new types? Naming convention, namespace, etc.? Final definitions by ontology group.
  - For now, use namespace=LD4L in Ruby with link <http://ld4l.org/ontology/... – to be defined by ontology group
  - Class name=ld4l:VirtualCollection
  - type URI=<http://ld4l.org/ontology/VirtualCollection>
  - instance URI=<http://localhost:3000/individual/vc123> –
    - what ever I want for now
    - suggest use of individual in URI meaning an instance of a class (used by VIVO too)
    - id starts with alpha because syntax something:vc123 – cannot have number directly after :

...

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Old Version 42

New Version 43

Key

Example 1-co: A Virtual Collection as an ordered collection of items using Collection Ontology's List with one item

Example 1-ore: A Virtual Collection as an ordered collection of items using ORE Ontology's Aggregation with one item

Example 2-co: A Virtual Collection as an ordered collection of items using Collection Ontology's List with multiple ordered items

Example 2: A Virtual Collection as a List with multiple ordered Items

Example 2-ore: A Virtual Collection as an ordered collection of items using ORE Ontology's Aggregation with multiple ordered items