fix id parsing

Question 1

libfolia accepts constructions like

<s id="s.1"/>

This should be:

<s xml:id="s.1"/>

Question 2

This is a bit related to proycon/folia#64
which should be fixed too

Answer · 2019-01-21T22:08:03.000Z

This is a bit related to proycon/folia#64
which should be fixed too

Question 3

fixed. no longer accept this

Answer · 2019-03-18T10:25:34.000Z

fixed. no longer accept this