libplist unterminated entity reference converting node to xml

When libplist converts dictionary keys containing special characters, the conversion fails with the libxml2 error: unterminated entity reference.

In the source file xplist.c, if the following modification is made:

if (node_data->type == PLIST_STRING) {

to:

if (node_data->type == PLIST_STRING || node_data->type == PLIST_KEY) {

The xml file is output as expected.

The test file as binary plist is the following: (base64 encoded)

YnBsaXN0MDDRAQJfECBEYXRlICYgVGltZXxMYWJlbCBmb3IgZXZlbnQgdGltZWVl5WcfVIxl9pX0
CAsuAAAAAAAAAQEAAAAAAAAAAwAAAAAAAAAAAAAAAAAAADk=

This is the error output:

error : unterminated entity reference  Time|Label for event time
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key/>
        <string>日期和时间</string>
</dict>
</plist>

Expected:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>Date &amp; Time|Label for event time</key>
        <string>日期和时间</string>
</dict>
</plist>