XML error · InvalidTag
Unclosed tag
The document ended, or a construct swallowed the rest of it, while an element was still open.
Unclosed tag 'urlset'.What it means
The parser reached the end of the input with an element still waiting to be closed. Sometimes the element really is unclosed; just as often the document was truncated, or an unterminated comment or CDATA section ate everything after it.
This is the signature error of a partial download or a write that was cut short, which is why it is common on large generated sitemaps and feeds.
What usually causes it
- The file is truncated — an interrupted download, a full disk, or a stream closed early.
- An unterminated comment: <!-- with no matching -->.
- An unterminated CDATA section: <![CDATA[ with no matching ]]>.
- A generator that writes an opening tag then throws before writing the close.
- A response body cut off by a proxy or gateway timeout.
How to fix it
- Compare the byte size against Content-Length or the source to confirm truncation.
- Search for <!-- and <![CDATA[ counts and check each one is closed.
- Re-fetch the document; transient truncation is common on large files.
- Make the generator write to a buffer and emit only on success, so partial output never ships.
The same error elsewhere
Different parsers, same defect. If you arrived with one of these messages, you are in the right place.
libxml2 (PHP, lxml, Nokogiri)
Premature end of data in tag urlset line 1Xerces (Java)
XML document structures must start and end within the same entity.expat (Python)
no element found: line 3, column 0Go encoding/xml
unexpected EOF
Before and after
Both snippets are checked on every build: the first is confirmed to produce the error above, the second to parse cleanly.
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url><loc>https://example.com/</loc></url><urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url><loc>https://example.com/</loc></url>
</urlset>Where this bites most
Other XML errors
- Expected closing tag
- Closing tag has not been opened
- Character is not expected
- Start tag expected
- XML declaration allowed only at the start of the document
- Attribute is without value (unquoted attribute value)
- Attribute is repeated
- Attributes have open quote
- Tag is an invalid name
- Invalid tags found (open elements at end of input)
Get started
Bring order to the XML your team can't afford to ignore.
Create a free account and get a private workspace to search, validate, diff, and monitor your XML feeds, sitemaps, schemas, and vendor integrations.