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 * \param out the output symbol.
 * \return 0 when success, -1 when failure happens
 */
int MXSymbolCreateFromFile(const char *fname, SymbolHandle *out);
/*!
 * \brief Load a symbol from a json string.
 * \param json the json string.
 * \param out the output symbol.
 * \return 0 when success, -1 when failure happens
 */
int MXSymbolCreateFromJSON(const char *json, SymbolHandle *out);
/*!
 * \brief Save a symbol into a json file.
 * \param symbol the input symbol.
 * \param fname the file name.
 * \return 0 when success, -1 when failure happens
 */
int MXSymbolSaveToFile(SymbolHandle symbol, const char *fname);
/*!
 * \brief Save a symbol into a json string
 * \param symbol the input symbol.
 * \param out_json output json string.
 * \return 0 when success, -1 when failure happens
 */
int MXSymbolSaveToJSON(SymbolHandle symbol, const char **out);
/*!
 * \brief Free the symbol handle.
 * \param symbol the symbol
 * \return 0 when success, -1 when failure happens
 */
int MXSymbolFree(SymbolHandle symbol);
/*!
 * \brief Copy the symbol to another handle
 * \param symbol the source symbol
 * \param out used to hold the result of copy