MHL Checker

The MHL Checker validates MHL markup by parsing input sources and reporting syntax and structural issues. It accepts MHL as plain text and returns a structured report detailing errors, warnings, and conformance to core tagging rules. It is designed for developers, technical writers, and QA engineers who integrate MHL checks into build pipelines or content audits.
Conceptually, the tool performs lexical analysis to tokenize MHL elements, builds a hierarchical parse tree, and validates tag pairing, required attributes, and content ordering. When issues are found, it reports the location (character or line), the error type, and suggested remedies. It can operate in strict or lenient mode depending on project requirements, and it supports exporting results in human-readable forms and machine-readable JSON for automation.
Unique value includes a precise error taxonomy, concise human-readable output, and an optional JSON summary for automation. Use cases include pre-commit checks, CI pipelines, content authoring workflows, and educational contexts where learners verify clean MHL syntax. The tool does not render or execute MHL; it remains a validator that guides corrections. Typical configurations cover UTF-8 normalization, deprecated pattern detection, and custom rule sets to match internal standards. This combination helps teams reduce rendering issues, speed up content pipelines, and maintain consistent markup quality across large documentation ecosystems.