http://hl7.org/fhir/StructureDefinition/questionnaire-sliderStepValue|4.0.1

For slider-based controls, indicates the step size to use when toggling the control up or down.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/integer