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/*!
 * \brief Copy the symbol to another handle
 * \param symbol the source symbol
 * \param out used to hold the result of copy
 * \return 0 when success, -1 when failure happens
 */
int NNSymbolCopy(SymbolHandle in, SymbolHandle *out);
/*!
 * \brief Print the content of symbol, used for debug.
 * \param symbol the symbol
 * \param out_str pointer to hold the output string of the printing.
 * \return 0 when success, -1 when failure happens
 */
int NNSymbolPrint(SymbolHandle in, const char **out);
/*!
 * \brief Get string attribute from symbol
 * \param symbol the source symbol
 * \param key The key of the symbol.
 * \param out The result attribute, can be NULL if the attribute do not exist.
 * \param success Whether the result is contained in out.
 * \return 0 when success, -1 when failure happens