I've found some suitable AQL queries for the problem that is
described here. I tested them on the Sanger Chr6 data using
AQL has seen a lot of development since version 4.7, so you
may encounter some problems if you start playing with
advanced queries. We're currently testing our development
version where most initial AQL problems have been fixed.
Note that tace doesn't understand multiline queries (you can
add a \ at the end of each line to wrap around). The textual
formatting across multiple lines just looks nice and shows
how the query is structured.
Both queries make use of the compound notation to access a
local tag. We dereference the object from the class by
following the map tag (the arrow is the notation for
following a tag). But once we've positioned mn (MapName) at
that position we want to stay there in the object and go to
the local tags position or left/right within the same
object. Therefore the  notation.
On Thu, 16 Sep 1999 mummi at decode.is wrote:
> I have been having problems with querying subtags within constructed
> subtypes. I am trying to extract all the contigs from a certain region
> on Chromosome 6 (the Sanger FTP-data), querying the Map tag and
> continuing to the Map_position. This works just fine with, say, the STS
> objects which only have one Position value
>> "find STS Map = Chr_6 & NEXT & NEXT > 70000 AND HERE <100000"
select s, pos
from s in class STS,
mn in s->Map
where mn = "Chr_6",
pos in mn[Position]
where pos > 70000 and pos < 100000
I get 200 lines in the result.
> but the contigs are maps with two location valus, Left and Right. I
> imagined that doing
>> "find Map Map = Chr_6 & NEXT # Ends # Left >70000"
select m, l, r
from m in class map,
mn in m->Map
where mn = "Chr_6",
l in mn[left]
where l > 70000,
r in mn[right]
The result table has 250 lines.
> would work or something similar, but none of the stuff I've tried
> I wound up just picking the relevant contigs out by hand and into a
> keyset, but this query-problem keeps nagging me still. is it perhaps
> not possible to query such subtags (Ends split into Left and Right)
> inside a constructed subtype like Map_position?
>> Thanks in advance, greetings from Iceland to everybody on the list ;)
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