good sample for study data model.

AddressBook
...........\.DS_Store
...........\AddressBook.xcodeproj
...........\.....................\eakmeister.mode1v3
...........\.....................\eakmeister.pbxuser
...........\.....................\eakmeister.perspectivev3
...........\.....................\gzcp.mode1v3
...........\.....................\gzcp.pbxuser
...........\.....................\michael.mode1v3
...........\.....................\michael.pbxuser
...........\.....................\pauldeitel.mode1v3
...........\.....................\pauldeitel.pbxuser
...........\.....................\project.pbxproj
...........\.....................\xcuserdata
...........\.....................\..........\lyman.xcuserdatad
...........\.....................\..........\.................\xcschemes
...........\.....................\..........\.................\.........\AddressBook.xcscheme
...........\.....................\..........\.................\.........\xcschememanagement.plist
...........\AddressBook_Prefix.pch
...........\AddViewController.xib
...........\build
...........\.....\AddressBook.build
...........\.....\.................\AddressBook.pbxindex
...........\.....\.................\....................\categories.pbxbtree
...........\.....\.................\....................\cdecls.pbxbtree
...........\.....\.................\....................\decls.pbxbtree
...........\.....\.................\....................\files.pbxbtree
...........\.....\.................\....................\imports.pbxbtree
...........\.....\.................\....................\pbxindex.header
...........\.....\.................\....................\protocols.pbxbtree
...........\.....\.................\....................\refs.pbxbtree
...........\.....\.................\....................\strings.pbxstrings
...........\.....\.................\....................\..................\control
...........\.....\.................\....................\..................\strings
...........\.....\.................\....................\subclasses.pbxbtree
...........\.....\.................\....................\symbols0.pbxsymbols
__MACOSX
........\AddressBook
........\...........\build
........\...........\.....\AddressBook.build
........\...........\.....\.................\._AddressBook.pbxindex
AddressBook\build\AddressBook.build\Debug
...........\.....\.................\.....\AddressBook.build
...........\.....\.................\.....\.................\AddressBook.dep
...........\.....\.................\.....\.................\AddressBook~.dep
...........\.....\.................\.....\.................\build-state.dat
...........\.....\.................\.....\.................\build-state~.dat
...........\.....\.................\Debug-iphoneos
...........\.....\.................\..............\AddressBook.build
...........\.....\.................\..............\.................\AddressBook-all-target-headers.hmap
...........\.....\.................\..............\.................\AddressBook-generated-files.hmap
...........\.....\.................\..............\.................\AddressBook-own-target-headers.hmap
...........\.....\.................\..............\.................\AddressBook-project-headers.hmap
...........\.....\.................\..............\.................\AddressBook.dep
...........\.....\.................\..............\.................\AddressBook.hmap
...........\.....\.................\..............\.................\AddressBook.xcent
...........\.....\.................\..............\.................\AddressBook~.dep
...........\.....\.................\..............\.................\Objects-normal
...........\.....\.................\..............\.................\..............\armv6
...........\.....\.................\..............\.................\..............\.....\AddressBook.LinkFileList
...........\.....\.................\..............\.................\..............\.....\AddressBookAppDelegate.o
...........\.....\.................\..............\.................\..............\.....\AddViewController.o

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