Don't forget to escape XML characters in output

scripts/stanza-annotator.py

@@ -4,6 +4,7 @@ import os
 import os.path
 import stanza
 import sys
+from xml.sax.saxutils import escape, quoteattr
 
 class Annotator:
     def __init__(self, source, target):
@@ -45,10 +46,10 @@ class Annotator:
         print('\t</s>', file=target)
 
     def encode_token(self, token, target):
-        form = token.text
-        lemma = '+'.join(map(lambda w: w.lemma, token.words))
-        upos = '+'.join(map(lambda w: w.upos, token.words))
-        print(f'\t\t<w lemma="{lemma}" pos="{upos}">{form}</w>', file=target)
+        form = escape(token.text)
+        lemma = quoteattr('+'.join(map(lambda w: w.lemma, token.words)))
+        upos = quoteattr('+'.join(map(lambda w: w.upos, token.words)))
+        print(f'\t\t<w lemma={lemma} pos={upos}>{form}</w>', file=target)
 
 if __name__ == '__main__':
     Annotator(sys.argv[1], sys.argv[2]).run()