Rob Vesse created JENA-675:
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Summary: Add and use a WriterProfile API
Key: JENA-675
URL: https://issues.apache.org/jira/browse/JENA-675
Project: Apache Jena
Issue Type: Improvement
Components: ARQ, RIOT
Affects Versions: Jena 2.11.1
Reporter: Rob Vesse
Currently we have a {{ParserProfile}} which allows specifying certain aspects
of input behaviour such as Prologue and Label to Node ID
However we don't have a corresponding {{WriterProfile}} API, we actually have a
class called {{OutputProfile}} but this is never actually used anywhere.
This would be particularly useful for languages that rely on the
{{NodeFormatter}} API where we can find comments such as the following:
{quote}
// Replace with a single "OutputPolicy"
{quote}
The lack of this API means we don't provide users any ability to do things like
control how blank node IDs are allocated. And existing functionality we do
give them like providing a set of namespaces and base URI to use for
serialisation needs to be folded into this API.
I know of two places where this is currently causing issues:
* In the incoming Hadoop RDF Tools code (JENA-666) many output formats
currently mangle the data when outputting blank nodes because they can't share
a {{NodeToLabel}} instance over multiple writer runs.
* In an internal bug at Cray we're seeing a situation where different code
paths lead to different presentation of blank nodes and we have no APIs to
allow us to control this presentation.
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