[android-developers] Library development - Development requirements

Hi,

Can anyone explaing what Table 1 ("Minimum versions of SDK tools and
plaforms on
which you can develop library projects.")'s columns really mean. Table is here:

http://developer.android.com/guide/developing/eclipse-adt.html#libraryProject

I.e.

component: Android 1.5 platform, minimum version: r4 or higher

but

component: Android 2.2 plaftorm, minimum version: r1 (or higer).

Blame my English, but I simply do not get what this minimum version
really refer to. Thanks in advance

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