What values are stored in .xml file that comes from FaceRecognizer::save ?

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Hello guys, i'm a newbie in OpenCV and now i'm making a project about Face Recognition with Eigenface algorithm. I got confused about what value are stored in .xml file when i use

faceRecognizer = createEigenFaceRecognizer();
faceRecognizer->train(faceData, faceLabels);
faceRecognizer->save("file_eigenfaces.xml");

is it the eigenfaces values (eigenvectors, eigenvalues, mean) stored in "file_eigenfaces.xml" ?

I'hv been read the explanation about FaceRecognizer::save at OpenCV docs (sorry, can't embed that link) but it doesn't answer my question, because it explain that it "saves a FaceRecognizer and its model state". What is that mean ?.

Thank you in advance for read my question, hope somebody can help me to understand this, sorry for newbie and bad english :D . Regards, William