How to install src package in SUSE?

I use zypper si command to install source package in SUSE: localhost:/dev/disk/by-id # zypper si zlib Reading installed packages... Loading repository data... Resolving package dependencies... The following source package is going to be installed: zlib 1 source package to install. Overall download size: 587.0 KiB. Already cached: 0 B. After the operation, additional 597.7 KiB will be used. Continue? [y/n/? shows all options] (y): y Checking for file conflicts: ........................................................................................................[done] But when I use the command: zypper se to check package state, it shows "not installed": localhost:/dev/disk/by-id # zypper se zlib Loading repository data... Reading installed packages... S | Name | Summary | Type --+------+--------------------------+----------- | zlib | Data Compression Library | srcpackage Could anyone give some clues?