Github user fpservant commented on the issue:
https://github.com/apache/jena/pull/139
Andy,
I have reverted to an unmodified version of RDFDataMgr (without write
methods with a context param).
I am sorry that I take so long to finalize this stuff. Remember that one
thing that we want to be able to do is to pass a (JSONLD) context (as a jena
context) to the Writer, in order to have it used when computing the output. But
there is a problem with JSONLD java (see [issue
184](https://github.com/jsonld-java/jsonld-java/issues/184)): it doesn't seem
possible (or at least, easy) to let the user set the (JSONLD) context to
something like ``"@context": "http://schema.org/"``. The best that I can do is
to pass the content corresponding to the URL (downloaded and converted to a
map) to the JSONLD API, and then to substitute the @context value with
"http://schema.org/"; at the end of the process (just before writing the output).
(I hadn't seen this problem when I created the pull request, because at
this time, there was no way to have JSON-LD java download externally defined
contexts, because of incompatible versions of HttpClient used by jena and
json-ld java).
Regarding the way to expose the Symbols that can be set it the (jena)
context, and the classes expected for the corresponding values, are you OK with
a JSONLDWriteContext class (extending Context), with methods such as:
```
public void setOptions(JsonLdOptions opts) {
set(JSONLD_OPTIONS_SYMBOL, opts);
}
```
I try to finalize something quickly and I update this.
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