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