Proper sparql endpoint?

[vojtechhuser]

The code below tries to submit a query to the endpoint but it requires the syntax to be at the end of the URL with q=.

How to submit a query from within R using the SPARQL standard package.
It works with many other endpoints just fine.

library(SPARQL)
Loading required package: XML
Loading required package: RCurl
Loading required package: bitops
endpoint<-'http://data.linkedct.org/sparql'
qs<-"

• PREFIX meshv: http://id.nlm.nih.gov/mesh/vocab#
• PREFIX mesh: http://id.nlm.nih.gov/mesh/
• SELECT DISTINCT ?predicate
• FROM http://id.nlm.nih.gov/mesh
• WHERE {
• ?s ?predicate ?o
• }
• ORDER BY ?p
• "
  cat(qs)

PREFIX meshv: http://id.nlm.nih.gov/mesh/vocab#
PREFIX mesh: http://id.nlm.nih.gov/mesh/

SELECT DISTINCT ?predicate
FROM http://id.nlm.nih.gov/mesh
WHERE {

?s ?predicate ?o

}
ORDER BY ?p

rs<-SPARQL(url=endpoint, query=qs)
Error: XML content does not seem to be XML: ''
rs<-SPARQL(url=endpoint, query=qs)
Error: XML content does not seem to be XML: ''