about std.csv and derived format

[bioinfornatics]

Dear,

I would like to parse this file:
http://genome.ucsc.edu/goldenPath/help/ItemRGBDemo.txt

struct Bed{
	string    chrom;	// 0
	size_t    chromStart;	// 1
	size_t    chromEnd;	// 2
	string    name;		// 3
	size_t    score;	// 4
	char      strand;	// 5
	size_t    thickStart;	// 6
	size_t    thickEnd;	// 7
	size_t[3] itemRgb;	// 8
        size_t    blockCount;	// 9
        size_t    blockSizes;	// 10
        size_t    blockStarts;	// 11
}

In more fields 3 to 11 are optional. Then you can have:
* field 0 - 3
* field 0 - 4
* field 0 - 5
... to 0 - 12