hello, there,


I run into some problems in using biomaRt to mine the transcript structures:

==============
library(biomaRt)
mart<-useMart("ensembl", dataset="hsapiens_gene_ensembl")
listAttributes(mart)$name->attrs
attrs[grep("exon",attrs)]
==============



why "structure_exon_stable_id", "structure_exon_chrom_start",
"structure_exon_chrom_end" and "structure_exon_rank" are not avaliable?



================
sessionInfo()
R version 2.7.1 (2008-06-23)
i386-pc-mingw32

locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252

attached base packages:
[1] grid      stats     graphics  grDevices utils     datasets  methods
base

other attached packages:
[1] GenomeGraphs_1.0.0 biomaRt_1.14.0     RCurl_0.9-4

loaded via a namespace (and not attached):
[1] tools_2.7.1 XML_1.96-0
=================


Thanks,

---
Ligang

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