notebooks, 100, spiral-bound
pencils, 300, #2 with erasers
pens, 500, blue ink
    

{
    resultDelimiter: "\n",
    fieldDelimiter: ",",
    resultFields: [{key:"product"}, {key:"quantity"}, {key:"detail"}]
}
    

In order to use DataSchema.Text, input data must be delimited text. Define as your schema's resultDelimiter property the string that separates each result, and define as your schema's fieldDelimiter property the string that separates each field of each result.

YUI().use("dataschema-text", function(Y) {
    var data_in = "notebooks, 100, spiral-bound\\npencils, 300, #2 with erasers\\npens, 500, blue ink",
        schema = {
            resultDelimiter: "\\n",
            fieldDelimiter: ",",
            // Or simply: ["product", "quantity", "detail"]
            resultFields: [{key:"product"}, {key:"quantity"}, {key:"detail"}]
        },
        data_out = Y.DataSchema.Text.apply(schema, data_in));

    alert(data_out);
});