[fw-core] Zend_Db_Table_Abstract

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Hello,
in Zend_Db_Table_Abstract.php there is a function
"protected function _setupMetadata()" in which this line appears:

$cacheId = md5("$this->_schema.$this->_name");

My questions are:
What is the reason to md5 the cacheId?
Isn't it potentially dangerous to build the cache-ID this way?
What about the risk of md5-collisions if other modules build
their cache-IDs like this, too?

Regards
Matthias Buesing,Germany
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