Can Android application install another application inside of it's own storage space?

Does anyone know if you can install an apk inside of another apk's storage space? My goal is to create an application which can "house" other applications inside of itself. Or possibly if one application can get the INSTALL_PACKAGES permission (which I believe is reserved by SYSTEM?) could it install 开发者_JS百科applications in a specific location on the device or the SD card?

Imagine an application that can just load other applications and install them on your device without your consent. Especially if the loaded application uses different permissions as the "host"-application.

I hope this is not possible. At least not without user interaction!
Otherwise we would be facing severe security leaks and open doors for malware ...

If you use the same package name for both applications, you could share the storage space.