getNumberOfAlternatives: Get number of alternatives

In RXMCDA: Functions to Parse and Create XMCDA Files

Description

Extracts the number of alternatives from the <alternatives> tag from an XML tree written according to the XMCDA standard.

Usage

getNumberOfAlternatives(tree, mcdaConcept = NULL)

Arguments

tree	Object containing the XMCDA XML tree.
mcdaConcept	A string containing the specific mcdaConcept attribute which should be searched for.

Value

The function returns a list structured as follows:

–	The first elements contain the number of alternatives of each <alternatives> tag found in <tree>. These elements are named according to the mcdaConcept attribute if it can be found.
status	Either OK if all the <alternatives> tags could be correctly read, or the description of the error.

Examples

tree = newXMLDoc()

newXMLNode("xmcda:XMCDA", 
           namespace = c("xsi" = "http://www.w3.org/2001/XMLSchema-instance", 
           "xmcda" = "http://www.decision-deck.org/2009/XMCDA-2.0.0"), 
           parent=tree)

root<-getNodeSet(tree, "/xmcda:XMCDA")

alternatives<-newXMLNode("alternatives", parent=root[[1]], namespace=c())

newXMLNode("alternative",attrs = c(id="x1"), parent=alternatives, namespace=c())

newXMLNode("alternative",attrs = c(id="x2"), parent=alternatives, namespace=c())

y<-getNodeSet(tree,"//alternatives")

x<-getNumberOfAlternatives(y[[1]])

RXMCDA documentation built on May 1, 2019, 10:23 p.m.