[Bioperl-l] accessing optional qualifiers within features?

[Ewan Birney]

On Mon, 13 Nov 2000, Samuel Aparicio wrote:

> Ewan Birney wrote:
> 
> Hi Ewan,
> Thanks for this example - it helped to clear things up.
> I notice that filling the array in the example you gave generates
> an exception if any of the primary tags do not have at least one tag
> value 'note'. I guess it is the expected behaviour here that the
> method throws an exception rather than returning a null?

I guess you are meant to test this first with

->has_tag('note');

before calling each_tag_value('note') as Hilmar's code snippet suggests.

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