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https://issues.apache.org/jira/browse/COMMONSRDF-13?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14509609#comment-14509609
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Reto Gmür commented on COMMONSRDF-13:
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[~andy.seaborne] I did not suggest to rely on the same JVM object reference,
just that no identifier should be exposed via the API. The implementation might
use whatever it likes to determine identity so the 3 use cases you present are
use against against basing blanknode identity on being the same object instance
but not arguments for exposing the identifier via the API.
> Demo-code to show advantages of exposed Blank Node identifier
> -------------------------------------------------------------
>
> Key: COMMONSRDF-13
> URL: https://issues.apache.org/jira/browse/COMMONSRDF-13
> Project: Apache Commons RDF
> Issue Type: Improvement
> Reporter: Reto Gmür
>
> Like many APIs but unlike the RDF Data model the BlankNode interface exposes
> an internal identifier. BlankNodes with the same identifier are mandated to
> be equals if the are created with the same RDFTermFactory.
> The concept of identifier has a match in many concrete syntaxes, however the
> usage in the API is different, as a graph may have different BNodes with the
> same identifier if they are created by different factories.
> The blank node identifier has been causing difficulties and been the subject
> to discussions. It is particularly problematic onbackend that do not expose
> such identifiers but which allow modifications (e.g. SPARQL backend), see
> also:
> http://mail-archives.apache.org/mod_mbox/commonsrdf-dev/201503.mbox/%3CCALvhUEXSSwO-Udj6ngdedVQuPC6n=+983ubnkyobs2psy5k...@mail.gmail.com%3E.
> To allow some evidence based discussion with this issue I ask proponent of
> exposing the blank node ID to provide some minimal code examples showing the
> advantage of having the ID exposed, i.e. code that could not easily be
> written without the BlankNode.internalIdentifier() method and the
> RDFTermFGactory.createBlankNode(String identifier) method.
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