Parsing files when standalone="yes"

[Charlie_X]

```python
from lxml.etree import fromstring

src = """
<?xml version="1.0" standalone="yes"?>
<externalLink xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
  <oleLink xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" r:id="rId1" progId="Word.Document.12">
    <oleItems>
      <oleItem name="!OLE_LINK1" advise="1" preferPic="1"/>
    </oleItems>
  </oleLink>
</externalLink>
"""

xml = fromstring(src)
 File "<string>", line 1, in ?
lxml.etree.XMLSyntaxError: Blank needed here, line 1, column 21 (<string>, line 1)
```

Python : sys.version_info(major=3, minor=8, micro=18, releaselevel='final', serial=0)
lxml.etree : (5, 1, 0, 0)
libxml used : (2, 12, 3)
libxml compiled : (2, 12, 3)
libxslt used : (1, 1, 39)
libxslt compiled : (1, 1, 39)

I've seen this reported for python-docx and it seems to be related to changes in libXML2. But as I couldn't find anything here I'm submiting this report.

[scoder (scoder)]

This seems to have been fixed in libxml2 2.12.4:
https://gitlab.gnome.org/GNOME/libxml2/-/commit/1e6b17b8348f9b8d485febaf410d2c419d254924

I'll see that I use at least 2.12.5 in the wheels of the next release.

[Charlie_X (charlie)]

Thanks for the quick reply. Great news, I can look forward to tests no longer failing soon.
Seem to remember a similar regression in libxml2 a couple of years ago.