complex data structure in elisp

[Dirk80]

Hi,

sorry for this beginner question. But I'm very interested how you would
represent the data structure of my example in elisp.

Here my example:
I want to implement a vocabulary trainer in elisp.

I have units. A unit is consisting of lessons and lessons are consistng of
sublessons. One sublesson is consisting of vocabularies. A vocabulary is
consisting of an audio-file, picture file and a text.

Here how I would do it in C:

struct Vocabulary
{
    char audio_file[255];
    char picture_file[255];
    char text[1000];
};

struct SubLesson
{
    int nb_vocabularies;
    struct Vocabulary[1000];
};

struct Lesson
{
    int nb_sub_lessons;
    struct SubLesson sub_lessons[10];
};

struct Unit
{
    int nb_lessons;
    struct Lesson lessons[10];
};

struct UnitList
{
    int nb_units;
    struct Unit units[8];
};

e.g. Unit 4, Lesson 7, Sublesson 2, Vocabulary 1, audio-file
struct UnitList unit_list;
unit_list.units[3].lessons[6].sub_lessons[1].vocabulary[0].audio_file =
"hello.wav";

Now to the details of using. Because I think this is important in elisp
because of performance.
This "UnitList" shall be initialised with content. During runtime it will
never be changed. 

Thank you a lot in advance for your help
Dirk

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