# 2. escape '.' # '.' exists in protogeni object names and are not delimiters
# 3. replace ':' with '.' # ':' is the urn hierarchy delimiter
# 4. join list elements using '.'
# 2. escape '.' # '.' exists in protogeni object names and are not delimiters
# 3. replace ':' with '.' # ':' is the urn hierarchy delimiter
# 4. join list elements using '.'