XML Parsing Error: undefined entity

[dome90]

XML Parsing Error: undefined entity
Location: Adresse: http://bueltge.de/comments/feed/
Line Number 8, Column 21:
     <title>Kommentare f&uuml;r bueltge.de [by:ltge.de]</title>
---------------------------^

The problem is the translation of 'on' -> für, so ü = ü

[DD32]

the ü entity is a valid entity, however appears to not be included in the refence list which the XML parser is using.

WP includes a function ent2ncr() which would convert ü to ü, would that be a valid solution for this? Or is this not a 'real' problem with WordPress, and the XML parser isnt reconising the non-english entities?

[nbachiyski]

Replying to DD32:

the ü entity is a valid entity, however appears to not be included in the refence list which the XML parser is using.

WP includes a function ent2ncr() which would convert ü to ü, would that be a valid solution for this? Or is this not a 'real' problem with WordPress, and the XML parser isnt reconising the non-english entities?

The only named entities part of the XML standard are quot, amp, apo, gt and lt, all the others are part of HTML's DTD. ent2ncr was introduced exactly for this reason: add_filter('the_content_rss', 'ent2ncr', 8);

Wrapping all translations in ent2ncr() will do the trick, but I will think of a more general solution. Next time we will surely forget to add it.

[DD32]

The only named entities part of the XML standard are quot, amp, apo, gt and lt, all the others are part of HTML's DTD.

Ah, For some odd reason i was thinking that XML included the HTML DTD's entities..

[nbachiyski]

​http://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references

[dome90]

Replying to nbachiyski:
Will that fix come by update too? Or what should we do?

[ryan]

(In [10036]) No named entities in comment feeds. Props nbachiyski. fixes #8464

[nbachiyski]

Replying to dome90:

Replying to nbachiyski:
Will that fix come by update too? Or what should we do?

If you are ready to wait until middle of next week, it will be in 2.7. If you need it sooner, just apply the patch in the attached file above.

[nbachiyski]

A ü sneaked in.

[ryan]

(In [10068]) Remove uuml. Props nbachiyski. fixes #8464

[RavanH]

After 10 years, this bug seems to be back in 5.2.1

On a completely fresh install (no plugins, default theme) I added a tag with a ' (single quote) in the title. This converts to ’ in the feed title. This in turn, generates

This feed does not validate.

line 11, column 9: XML parsing error: <unknown>:11:9: undefined entity

for the tag feed on ​https://validator.w3.org/feed/

See ​https://validator.w3.org/feed/check.cgi?url=https%3A%2F%2F2607.fr%2Ftag%2Flapostrophe%2Ffeed%2F for example