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It is important to note that this should be done when the repository is first set up, before any content has been added.

Using SPARQL-Update to Bind Prefixes

To ensure that specific namespaces are used (i.e., treated as sacred) by Fedora 4 when doing a SPARQL update, ensure that the namespace prefix URI includes a terminating character. Otherwise system-generated JCR namespaces (e.g., ns001, ns002), and not the user-supplied namespaces, will get registered. Therefore, the following statement could lead to unexpected namespaces. F4 will register a system-generated namespace and you would not find "http://myurl.org" namespace in the system.

PREFIX esc: <http://myurl.org>
INSERT {
<>
esc:package "ppp";
}
WHERE { }

Therefore, the URI prefix in line 1 should have a terminating character, e.g., a slash or a hash. 

PREFIX esc: <http://myurl.org/>
. . .

"Initializing" a Repository with Additional Bindings

The inadvertent binding of namespaces to system-generated prefixes can be prevented by preemptively binding the namespaces that are likely to be used to standard prefixes.  This can be accomplished by creating a dummy node in the repository, adding desired namepace prefixes and RDF triples via a SPARQL update query, and then deleting the dummy node and the resulting tombstone to remove traces of this operation from the repository.  Even after all traces of the initialization node have been removed, the namespace bindings will persist in the repository and be available as RDF triples are added in the future.

#!/bin/bash
 
REST="http://localhost:8080/fcrepo/rest"
USER="fedoraAdmin"
PASSWORD="secret3"
 
QUERY="
    PREFIX pcdm: <http://pcdm.org/models#> 
    PREFIX bibo: <http://purl.org/ontology/bibo/>
    INSERT DATA { 
        <> a pcdm:Object ;
            bibo:shortTitle 'Fedora4 Site Initialization Page' .
        }"
 
curl -u $USER:$PASSWORD -X PUT "$REST/initialize/"
curl -u $USER:$PASSWORD -X PATCH -H "Content-Type: application/sparql-update" \
    --data "$QUERY" "$REST/initialize"
curl -u $USER:$PASSWORD -X DELETE "$REST/initialize"
curl -u $USER:$PASSWORD -X DELETE "$REST/initialize/fcr:tombstone"