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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: URIs, names and well known RDDL names, was: Re: Quick edit
John Aldridge <john.aldridge@i...> writes:
> At 10:24 10/01/2001 +0000, Henry S. Thompson wrote:
> >Quick followup -- I checked the XLink spec, and it's pretty clear that
> >
> >'role' is for properties of the target resource
> >'arcrole' is for properties of the target wrt to the link
> >
> >so my/Tim/Jason's proposal, that 'role' be the primary xlink attribute
> >we use to distinguish on rddl:resource from another, and 'arcrole' be
> >the secondary one, seems clearly preferrable to the status quo.
>
> I'm missing something here... To give an analogy, this seems to be like
> saying, when programming in C,
>
> struct {
> int a;
> int b;
> double c;
> } rddf;
>
> that the primary access to struct members should be by writing their
> datatype (int/double):
>
> rddf.double
>
> and that use of the member name (a/b/c) should only be used if necessary to
> disambiguate:
>
> rddf.int[sort=b];
I think the analogy is flawed, but I'll try to explain in these terms
anyway. What we're dealing with is a situation where looking a
variable up on the stack is expensive, and in many cases we only care
about the values of variables of a particular type. So we establish a
convention that we will name our variables using the following
strategy:
If there is only one variable of a particular type in a struct,
we'll use its type name (read namespaceURI) as its name (read
xlink:role);
If there are two or more variables of a particular type in a struct,
we'll use a combination of its type name and its function (read
xlink:arcrole) as its name.
So we get
struct {
double double;
int int.a;
int int.b;
} rddf;
Now we can decide which variables to evaluate (I told you the
analogy was flawed :-) based on their names.
ht
--
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
W3C Fellow 1999--2001, part-time member of W3C Team
2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
Fax: (44) 131 650-4587, e-mail: ht@c...
URL: http://www.ltg.ed.ac.uk/~ht/
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