The N-Triples specs tells about escaping double quotes in literals. Escaping should be done by the processing XSLT, not by the user writing XTriples configurations.
The representation of the lexical form consists of an initial delimiter " (U+0022), a sequence of permitted characters or numeric escape sequence or string escape sequence, and a final delimiter. Literals may not contain the characters ", LF, CR except in their escaped forms. In addition '\' (U+005C) may not appear in any quoted literal except as part of an escape sequence. The corresponding RDF lexical form is the characters between the delimiters, after processing any escape sequences. [RDF 1.1 N-Triples; sec. 2.3 RDF Literatls]
The N-Triples specs tells about escaping double quotes in literals. Escaping should be done by the processing XSLT, not by the user writing XTriples configurations.