// Creating an infotable using the required datashape for specifying the names of properties to purge
var propertiesToPurge = Resources["InfoTableFunctions"].CreateInfoTableFromDataShape( {
infoTableName : "InfoTable",
dataShapeName : "PropertyList"
});

// Adding the names of properties to the infotable created above
propertiesToPurge.AddRow({ propertyName: "propertyA-Logged" });
propertiesToPurge.AddRow({ propertyName: "propertyB-Logged" });
// Purging history
Things["TestThing"].PurgeSelectedPropertyHistory({
propertiesToPurge: propertiesToPurge, /* INFOTABLE */
startDate: 0, /* DATETIME */
endDate: dateAddYears((new Date()),1000) /* DATETIME */
});