I am trying to understand which characters need to be escaped when performing an insert or upsert using the RDF syntax on Dgraph. When looking at the following:

<subject> <predicate> <object> .

I already understood the when using special characters in the <predicate> part, (such as // in http://some-uri/...) this needs to be wrapped in <>. I can not easily find what the requirements for the are though. On those objects that represent strings that are user defined I expect users to insert for instance a double-quote, but in essence any character from UTF-8. Can someone point me to the documentation where I can find the requirements for escaping the <object>.

Thanks in advance, Sam