B.2.1.10 Descriptor

descriptorread	Get the descriptor contents
	`(desc-name:S,desc-text:S)=`descriptorread`(desc-id:I)`
	$\rightarrow$ The current node is used.
descriptorwrite	Create or update a descriptor under the current node
	`None=`descriptorwrite`(desc-name:S,desc-test:S)`
	$\rightarrow$ Unfair-remark: We should get the descriptor id as returned argument.
descriptors	Count number of descriptors
	`ndescriptor:I=`descriptors`()`
	$\rightarrow$ The 'ndescriptor' attribute has the same contents.