R version compatibility

Similar to rkward_min_version and rkward_max_version, the <dependencies> element allows specification of the attributes R_min_version and R_max_version. However, there are the following differences:

In many cases, it is easily possible to provide reduced functionality, if a certain feature is not available in the running version of R. Consider the following short example of a plugin .xml file:

<dialog [...]>
		<dependency_check id="ris210" R_min_version="2.10.0"/>
		<connect client="compression.xz.enabled" governor="ris210"/>
	<radio id="compression" label="Compression method">
		<option label="None" value="">
		<option label="gzip" value="gzip">
		<option id="xz" label="xz" value="xz">

In this example the compression option "xz" will simply be disabled when the R runtime version is older than 2.10.0 (which did not support xz compression). The <dependency_check> element supports the same attributes as the <dependencies> element in .pluginmap files. It creates a boolean property, which is true, if the specified dependencies are met, false otherwise.