XML   is not defined: how to fix HTML entities in XML
XML   is not defined: how to fix HTML entities in XML: handle ' ' / undefined entities with XML-safe alternatives. Fast no-upload XML workflow.
Entity references (& < ...)
Fix Entity references (& < ...). Validate XML structure and encoding, find the bad token/tag, then convert or re-export safely (no upload).
TL;DR: Validate locally, pinpoint the failing spot, apply the minimal fix, then validate again.
Fast no-upload workflow
- Validate the input (strict rules, correct encoding, correct delimiter/quotes).
- Locate the exact position/line reported by the parser or validator.
- Fix the smallest broken part (often a quote, escape, delimiter, or a truncated copy/paste).
- Re-validate and only then convert/export.
Recommended tools
Relevant guides
This list is auto-picked from existing guides. If you don’t see your exact case, use: search guides for “entity & <”.
Handle XML entities in JSON (no upload)
Understand how entity decoding works in DOMParser and how to validate output safely.
Escape '<' in XML: when to use &lt; vs CDATA
Escape '<' in XML: when to use &lt; vs CDATA: escape '<' as '&lt;' in text nodes. Fast no-upload XML workflow.
undefined entity: what it means and how to fix it
XML parser: undefined entity: what it means and how to fix it: escape reserved XML characters and validate locally. Fast no-upload XML workflow.
How to escape '&' in XML (and avoid entity reference errors)
How to escape '&' in XML (and avoid entity reference errors): escape '&' as '&amp;' and resolve incomplete entities. Fast no-upload XML workflow.
Escape '<' in XML (inside URLs): correct rules and fast fixes
Escape '<' in XML (inside URLs): correct rules and fast fixes: escape '<' as '&lt;' in text nodes. Fast no-upload XML workflow.
Escape '<' in XML (in embedded HTML fragments): correct rules and fast fixes
Escape '<' in XML (in embedded HTML fragments): correct rules and fast fixes: escape '<' as '&lt;' in text nodes. Fast no-upload XML workflow.
Escape '<' in XML (in text nodes): correct rules and fast fixes
Escape '<' in XML (in text nodes): correct rules and fast fixes: escape '<' as '&lt;' in text nodes. Fast no-upload XML workflow.
EntityRef: invalid name: what it means and how to fix it
XML parser: EntityRef: invalid name: what it means and how to fix it: escape '&' as '&amp;' and resolve incomplete entities. Fast no-upload XML workflow.
Go XML: undefined entity 'nbsp' (encoding/xml fixes)
Go XML: undefined entity 'nbsp' (encoding/xml fixes): handle '&nbsp;' / undefined entities with XML-safe alternatives. Fast no-upload XML workflow.
Search tools by keyword
Open tools search for “entity & <”.
Related subtopics
- Format/minify XML safely
- Illegal entity reference
- Invalid character in XML
- Duplicate attributes in a tag
- DOCTYPE/DTD parsing issues
- Default namespace issues
Related by intent
- Intent hub for Entity references (& < ...)
- Execution playbook
- Method comparison
- Alternative flows
- Migration path
- Benchmark baseline
- Case study
- Trend report
- Cluster pillar
- Cross-cluster pillar: JSON
- Linkable data asset
Expert signal
Expert note: Entity references (& < ...) usually resolves fastest when triage starts from strict validation and then branches to comparison/alternative paths based on input quality.
Data snapshot 2026
| Metric | Value |
|---|---|
| Intent confidence score | 75/100 |
| Predicted CTR uplift potential | 49% |
| Target crawl depth | < 4 clicks |
Trust note: All processing happens locally in your browser. Files are never uploaded.
FAQ (quick)
Start here: XML to JSON (runs locally, no upload).
Can I fix Entity references (& < ...) without uploading my data? Yes. no-upload.ru tools run locally in your browser (NO UPLOAD). Start with XML to JSON and keep samples redacted if you must share them.
What is the fastest safe workflow? Validate first, fix the smallest broken part, then validate again before converting/exporting. This prevents silent downstream issues.
Why does Entity references (& < ...) happen? Most issues come from copy/paste truncation, wrong encoding, non-strict syntax (comments/trailing commas), or a shape mismatch (array vs object).
Which tool should I start with for Entity references (& < ...)? Start with XML to JSON. If you still see errors, follow the related playbook/trend report on this page.
Privacy & Security
All processing happens locally in your browser. Files are never uploaded.