OptionalcontentFeature flags collected during content validation for cross-document checks
EPUB file data
Files extracted from EPUB container
OptionalmediaOPF media:active-class value (if declared)
OptionalmediaOPF media:playback-active-class value (if declared)
Validation messages collected so far
OptionalncxNCX UID for validation against OPF identifier
OptionalobfuscatedResources marked with IDPF font obfuscation in encryption.xml
OptionalopfPath to the package document (OPF)
Validation options
OptionaloverlayMedia overlay text link targets in order, for reading order validation (MED-015)
OptionalpackageParsed package document
OptionalreferencedResources referenced in content but not declared in manifest
Rootfiles found in container.xml
OptionaltocTOC navigation link targets in order, for reading order validation (NAV-011)
Detected EPUB version
Internal validation context passed through the validation pipeline