HanOostdijk

The Rmd file describes some tests I did with the beta implementation of OData V4 for CBS (Statistics Netherlands).
The resulting pdf file can be found here.

HanOostdijk

Remarks questions OData version 4 CBS beta.

- is there a place where I can post questions of this kind without troubling all followers of the LinkedIn group 
   `Centraal Bureau voor de Statistiek; Open Data` ?
   
- is there documentation about OData version 4 apart from the terrible https://lnkd.in/dkQMqWR and friends?

- Nesting of commands is not allowed?

    The functions (?) `indexof` and `tolower` work standalone but using the filter 

HanOostdijk

start UPDATE 01OCT2018
according to Dennis Ramondt (CBS Open Data) this is how it should work.
end   UPDATE 01OCT2018

Question about the `Get Entity` in OData version 4 CBS beta

If I want to retrieve the 23rd row of the Observations subtable of 900001NED, I can do this
in two ways. The data I get back is the same but the format is different. See res1 and res2 in last part of gist.

Questions: 

HanOostdijk

start UPDATE 30SEP2018:
In a comment on https://www.linkedin.com/feed/update/urn:li:activity:6449917998194008064
Dennis Ramondt (CBS Open Data) answers that the full $select functionality will be implemented only later
end UPDATE 30SEP2018

Support for $select in beta version CBS OData4

$select is not mentioned in the implementation document https://beta.opendata.cbs.nl/OData4/implement.html. 
When using the construct on three different subtables of 900001NED it behaves differently as shown below.
Here I use R code but I get the same results when I use the urls in an internet browser.

HanOostdijk

library(glue)

get_table_odata4 <- function (root=NULL,table="",subtable=NULL,query=NULL,verbose=F,encode=T) {
	if (is.null(subtable)) {
		subtable =""
	} else subtable =glue("/{subtable}")
	if (is.null(root)) 
		root = 	"https://acc-ccb.cbs.nl"
	if (is.null(query)) {