Hybris Basic each extension uses

Extentions

Core :
core ext requires acceleratorcms and solrserver
core-items.xml
items 
atomictypes
collectiontypes
enumtypes
maptypes
relations
itemtypes
<!--
         modifier defaults
            inital      = false
            read        = true
            write       = true
            optional    = true
            private     = false
            search      = true
   -->
core-spring.xml
<!-- Event listeners -->
<!-- Spring Integration --> like hot folder etc.
<!-- Solr field value providers -->
<!-- Business Process resources definition -->
<!-- Actions defined in business process xml file -->
<!-- Strategies-->
<!-- cron jobs -->
all cockpits and users and rights impexes are available here.
all VM templates and the localized email properties files.
process xml files



Storefront  :
storefront ext requires acceleratorstorefrontcommons and facades
It contains beans.xml
web/src
Validators
Controller
Checkout step controllers
Filters
CMS controllers
Handlers
multi-step-checkout-config.xml
spring-filter-config.xml
spring-security-config.xml
all jsps files in web folder directory


facades  :
ext requires acceleratorfacades and core
yacceleratorfacades-spring.xml

Converter
Populator
Facades
EmailContext


yacceleratorfacades-beans.xml
POJO beans


cockpits  :
cockpit ext required acceleratorservices cscockpit cmscockpit productcockpit reportcockpit acceleratorcms