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https://issues.apache.org/jira/browse/BEAM-1192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15796187#comment-15796187
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Kenneth Knowles commented on BEAM-1192:
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Another thing that is similar to URNs, but used differently, is the
`kindString` / `name`. We should clean this up at the same time.
> Give transforms URNs, use them instead of instanceof checks
> -----------------------------------------------------------
>
> Key: BEAM-1192
> URL: https://issues.apache.org/jira/browse/BEAM-1192
> Project: Beam
> Issue Type: New Feature
> Components: beam-model-runner-api
> Reporter: Kenneth Knowles
>
> In the [Beam Runner AP|https://s.apache.org/beam-runner-api], transforms of
> interest to runners are to be identified by URN.
> Currently, Java-based runners use `instanceof` checks to both override
> transforms and to implement primitive transforms. This language and
> SDK-specific behavior should be replaced by adding these URNs, and checking
> them.
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