Source: Schema.org v30.1 vocabulary. Official phoneticText property definition.
What does phoneticText mean?
Representation of a text [[textValue]] using the specified [[speechToTextMarkup]]. For example the city name of Houston in IPA: /ˈhjuːstən/.
Used on types (domainIncludes)
Expected value types (rangeIncludes)
Schema.org domainIncludes and rangeIncludes are descriptive guidance, not strict validation prohibitions. Check the official reference for updates.
Related reference
Browse all Schema.org types and properties · Google feature support status