Storing data in a directory

I need to store a set of records that are arranged in a tree structure. Each leaf contains what is essentially a lot of text, and each internal node simply branches into one or more subnodes. The structure would lend itself natrually to a file system with directories representing the internal nodes and text files representing the leaves.
I have considered simply defining a root directory and storing my data in it by creating subdirectories and text files. However, it is possible that I will not have access to the disk. I would like to keep my options open and be able to read and write from a filesystem like device which may or may not be the actual filesystem provided by the OS.
Is LDAP useful for this? Is there some other abstraction of a filesystem I can read and write from?

Hi
You could design a relational database to represent the structure (the data does not have to be represented in the same way that it is presented to the user). The following is an example.
ID |parentName |Name|Flags|
    |           |    |     |
    |           |    |     |
    |           |    |     |
    |           |    |     |
    |           |    |     |
    |           |    |     |
ID |Data                   |
    |                       |
    |                       |
    |                       |
    |                       |
    |                       |
    |                       |
    |                       |
    |                       |You may design the programme to implement the rules of the directory structure.

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