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XML Syntax Validator

Validate XML syntax with comprehensive error checking and compliance rules.
Works for both newly created documents and updates to existing ones — one tool checks both.

Validation Coverage
Well-formedness (tag mismatch, unclosed tags)
Level hierarchy validation (num nesting)
Every level must start with <title>
GUID format + duplicate detection
Footnote cross-reference + duplicate IDs
Footnote/<sup> nesting order
Bare URL / email detection
Issuing body / country-of-issue validation
Translation type / source / language rules
BookLoadType + Update date/GUID compliance
Issue-date / compliance-date status checks
Table structure validation
Image src (data URI) validation
Special character / junk character detection