Move to the next token in the data steam. Return 0 on success and a non‐zero value otherwise. Each call to advanceToNextToken invalidates the string references returned by the value accessor for prior nodes. This function may fail to move to the next token if doing so would advanced past a character sequence that is not valid JSON, and is guaranteed to do so (fail to move) if e_RELAXED != conformanceMode(). The behavior is undefined unless reset has been called.