Usually, the attributes value can be received by
_sectionName get3DENMissionAttribute _attributeName; // See example above
However, if the attribute was not changed and it is default value is used get3DENMissionAttribute might return Nothing, even though in Eden Editor the attribute has got a value. In that case the attribute's config name is not identical to the 'property' or 'data' config value. To get the right values in these cases one has to do:
_sectionName get3DENMissionAttribute _propertyName;
// or
_sectionName get3DENMissionAttribute _dataName;