Here are the data structures with brief descriptions:

_cache
_cacheVar
_dir
_file
_layout
_request
_root
_tpl
_view
abstract_auth
abstract_model
abstract_module
abstract_moduleembedded
abstract_pluginChart
abstract_pluginChartSVG
abstract_row
abstract_sgbd
abstract_sgbd_pdo
plugin_auth
plugin_autoload
plugin_chart
plugin_chartBar
plugin_chartBarSVG
plugin_chartHisto
plugin_chartHistoSVG
plugin_chartLine
plugin_chartLineSVG
plugin_chartPie
plugin_chartPieSVG
plugin_chartSVG
plugin_check
plugin_date
plugin_datetime
plugin_debug
plugin_debugError
plugin_form
plugin_gestionuser
plugin_html
plugin_i18n
plugin_jquery
plugin_log
plugin_mail
plugin_routing
plugin_rss
plugin_tpl
plugin_upload
plugin_valid
plugin_wsdl
plugin_xmlListObject
plugin_xmlObject
plugin_xsrf
sgbd_csv
sgbd_json
sgbd_mysql
sgbd_pdo_firebird
sgbd_pdo_mssql
sgbd_pdo_mysql
sgbd_pdo_oracle
sgbd_pdo_pgsql
sgbd_pdo_sqlite
sgbd_syntax_firebird
sgbd_syntax_mssql
sgbd_syntax_mysql
sgbd_syntax_oracle
sgbd_syntax_pgsql
sgbd_syntax_sqlite
sgbd_xml