David Carlisle schrieb:
No, I wanted: "If the count of <B>s for the interval is zero, the
interval is empty and I'm not interested;
what's the difference between "the count of B in the interval is zero"
and "the next element is a T not a B" it appears to be the same as far
as I can see, except the latter is easier to express in xpath.
Maybe a lack of precision, or too much verbosity, in my original post.
An interval is *not* defined in terms document position, but in terms of
the numbers in the text nodes attached to the <T> elements. I wrote:
<Urmel>
<T>0</T>
<T>6</T>
<T>12</T>
<T>18</T>
<T>24</T>
[...]
A <T> indicates a point in time. <T>s are ordered numerically.
Direct siblings define an interval starting at the earlier <T> and
ending before the later <T>.
Should have be more explicit here and state that the first interval goes
from 0 to 6, the second one from 6 to 12, and so on.
Sorry for confusing you!
Michael
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