construct a RelativePath from a string containing the relative path description. The string must comply to the OPCUA BNF for RelativePath ( see part 4 - Annex A)
{String}
Optional
{AddressSpace}
@example:
var relativePath = makeRelativePath("/Server.ServerStatus.CurrentTime");
construct a RelativePath from a string containing the relative path description. The string must comply to the OPCUA BNF for RelativePath ( see part 4 - Annex A)