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I think that it would be nice to define a limited subset of atomic/basic types that can be manipulated by the obitools. These type could be specified via several typedef in a C header file named obitypes.h

I propose the following but not exhaustive atomic types

types	C types	OBIType	Definition
integer	int32_t	OBIInt_t	a signed integer value
float	double	OBIFloat_t	a floating value
boolean	?	OBIBool_t	a boolean true/false value
char	char	OBIChar_t	a character

Two kind of container types

• List of atomic types
• Dictionary of atomic types indexed by string

Type specific to obitools

• taxids
• strings

| index | size_t | OBIIdx_t | an index in a data structure |

typdef enum {
	FALSE = 0;
	TRUE  = 1;
	OBIBool_NA= 2;
} OBIBool_t, *OBIBool_p;

We need for each of them to reserve an NA value, that can be define as a macro

#define OBIInt_NA (INT32_MIN) 
#define OBIFloat_NA (NAN)
#define OBIIdx_NA (SIZE_MAX)