What does “Create a domain model via POCO classes”

问题:

I have an assessment to solve. In the project solution which is given to me, there is a .csv file expected from me to process it. Here is how it looks like;

asset id,file_name,mime_type,created_by,email,country,description
51df6a98-614e-40ef-8885-95ae50940058,ElitProin.aam,application/x-authorware-map,sblack0,[e-mail],United States,Maecenas ut massa quis augue luctus tincidunt. Nulla mollis molestie lorem. Quisque ut erat.
279899c1-bc63-495c-94c5-57f25c881ed2,MusVivamusVestibulum.xla,application/x-excel,iadams1,[e-mail],Canada,"Curabitur in libero ut massa volutpat convallis. Morbi odio odio, elementum eu, interdum eu, tincidunt in, leo. Maecenas pulvinar lobortis est."
3060b1db-9a0a-4046-b10a-b90a0c440070,NullaUltrices.sit,application/x-sit,jmatthews2,[e-mail],Japan,"Duis bibendum, felis sed interdum venenatis, turpis enim blandit mi, in porttitor pede justo eu massa. Donec dapibus. Duis at velit eu est congue elementum."
7ef8ddf4-0b60-43e6-9e17-21029da02c69,Eros.tsv,text/tab-separated-values,dadams3,[e-mail],Serbia,"Curabitur in libero ut massa volutpat convallis. Morbi odio odio, elementum eu, interdum eu, tincidunt in, leo. Maecenas pulvinar lobortis est."
588610a3-b546-4c2e-822d-c822ba20a775,BlanditNam.aim,application/x-aim,dpierce4,[e-mail],United States,In congue. Etiam justo. Etiam pretium iaculis justo.
3de294a8-8f13-4f86-b447-92e8fd79277d,NecCondimentumNeque.jpe,image/jpeg,pyoung5,[e-mail],Romania,"Fusce posuere felis sed lacus. Morbi sem mauris, laoreet ut, rhoncus aliquet, pulvinar sed, nisl. Nunc rhoncus dui vel sem."
209bf3d7-e792-4f3f-98e8-240efcf81e31,DuisMattisEgestas.gif,image/gif,ldaniels6,[e-mail],Belgium,"Curabitur in libero ut massa volutpat convallis. Morbi odio odio, elementum eu, interdum eu, tincidunt in, leo. Maecenas pulvinar lobortis est."
975eaf96-dd9f-4534-89a6-0ebabb730aa0,HacHabitassePlatea.arj,application/octet-stream,smorales7,[e-mail],Spain,In congue. Etiam justo. Etiam pretium iaculis justo.

The applications which is asked from me to complete is like this;

// Create a domain model via POCO classes to store the data available in the CSV file below
// Objects to be present in the domain model: Asset, Country and Mime type
// Process the file in the most robust way possible
// The use of 3rd party plugins is permitted

So from what I understood from these steps, I have implemented a class structure;

    public class Asset
    {
        public int assetID { get; set; }
    }

    public class Country
    {
        public int countryName { get; set; }
    }

    public class Mime
    {
        public int mime { get; set; }
    }

But about the lack of theoretical concept behind POCO, I am not sure what I am doing, or what should I do.

1. Is that a correct "domain model" what I implemented?
2. Where I should use the other headers such as "file_name", "email" which is stated in .csv file?

Thanks in advance.