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title2: Final State - Collection

Continuing with the previous example of modeling and creating a book with LDP, PCDM and F4, here we will detail an approach for adding that book, "raven/" to a new collection, "poe/".

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The objective in this section is to leverage LDP interaction models to not only create the appropriate pcdm:hasMember relationship between the collection "poe/" and the book "raven/", but to put the LDP structure in place for a simplified addition of additional items to the "poe/" collection.

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titleCollection - Create DirectContainer

 Here we will begin to walk through the mechanics of creating the structures that will facilitate creation of the collection and its single member, in this case.

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First, create the top-level "collections/" pcdm:Object, which is also an ldp:BasicContainer.

 

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curl -i -XPUT -H"Content-Type: text/turtle" --data-binary @pcdm-object.ttl localhost:8080/rest/collections/

Where "pcdm-object.ttl" follows:

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titlepcdm-object.ttl
@prefix pcdm: <http://pcdm.org/models#>
 
<> a pcdm:Object .

Second, create the nested "poe/" pcdm:Object, which is also another ldp:BasicContainer.

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curl -i -XPUT -H"Content-Type: text/turtle" --data-binary @pcdm-object.ttl localhost:8080/rest/collections/poe/

Lastly, create an ldp:IndirectContainer, "members/" that will facilitate the establishment of relationships between "poe/" and the collection members.

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curl -i -XPUT -H"Content-Type: text/turtle" --data-binary @ldp-indirect.ttl localhost:8080/rest/collections/poe/members/

Where "ldp-indirect.ttl" follows:

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titleldp-indirect.ttl
@prefix ldp: <http://www.w3.org/ns/ldp#>
@prefix pcdm: <http://pcdm.org/models#>
@prefix ore: <http://www.openarchives.org/ore/terms/>

<> a ldp:IndirectContainer, pcdm:Object ;
  ldp:membershipResource </rest/collections/poe/> ;
  ldp:hasMemberRelation pcdm:hasMember ;
  ldp:insertedRelation ore:proxyFor .

Similar to the previously described ldp:DirectContaner, an ldp:IndirectContainer is an LDP construct that also activates the creation of certain RDF triples when a new resource is added as a child of this container.
Just like with a DirectContainer, when a new resource is added inside of the "members/" IndirectContainer, a new triple on the ldp:membershipResource ("poe/") will be created with the predicate defined by the ldp:hasMemberRelation property ("pcdm:hasMember").
However, the difference from a DirectContainer is that the subject of the created triple is not the newly added child, but instead the resource defined by the ldp:insertedRelation property (ore:proxyFor, in this case) found on the newly added child of this container.

We will see this in action next!