Extension modules are structural elements of an extension. 类似ABAP开发包的概念。

An extension may include several extension modules serving as structural elements. Each of them offers a certain set of functionality. The functionality of the extension that you wish to have depends on extension modules that you implement.

Extension module分为core和web两类。

core extension module包含这些组件：

1. type system definition

位于items.xml文件里，位置和命名规范：

1. java file
2. extension版本

In addition, every SAP Commerce package contains a file with no prefix. This package-related build.number file contains the same information as the <$extension>. files, but also has a list of the extensions contained by the package.

1. localization files, 用于本地化

web extension module

extension的一部分，可以被浏览器访问。

访问方式：

To launch a web extension module via your web browser, go to the URL path to Platform on the server/name of extension/starting page. For example, if you are running myExtension locally on default settings, the URL would be http://localhost:9001/myExtension.

You can set up the list of extensions that are available to SAP Commerce by:

1. Modifying the localextensions.xml file located in the <${HYBRIS_CONFIG_DIR}> directory.
2. Building SAP Commerce.

localextensions.xml的位置和内容：

<hybrisconfig xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:noNamespaceSchemaLocation='../bin/platform/resources/schemas/extensions.xsd'>
  <extensions>
    <path dir='${HYBRIS_BIN_DIR}' autoload='false' />
    <extension name='mcc' />
    <extension name='adaptivesearchsolr' />
    <extension name='adaptivesearchbackoffice' />
    <extension name='adaptivesearchsamplesaddon' />
    <extension name='adaptivesearchwebservices' />
    <extension name='commerceservicesbackoffice' />
    <extension name='solrfacetsearchbackoffice' />
    <extension name='solrserver' />
    <extension name='yacceleratorcockpits' />
    <extension name='yacceleratorinitialdata' />
    <extension name='yacceleratorfulfilmentprocess' />
    <extension name='yacceleratorstorefront' />
    <extension name='ycommercewebservices' />
    <extension name='ycommercewebservicestest' />
    <extension name='electronicsstore' />
    <extension name='acceleratorwebservicesaddon' />
    <extension name='orderselfserviceaddon' />
    <extension name='customersupportbackoffice' />
    <extension name='customerticketingaddon' />
    <extension name='commerceorgsamplesaddon' />
    <extension name='rulebuilderbackoffice' />
    <extension name='couponbackoffice' />
    <extension name='droolsruleengineservices' />
    <extension name='couponfacades' />
    <extension name='promotionenginesamplesaddon' />
    <extension name='cmswebservices' />
    <extension name='smarteditwebservices' />
    <extension name='cmssmarteditwebservices' />
    <extension name='permissionswebservices' />
    <extension name='smarteditaddon' />
    <extension name='cmssmartedit' />
    <extension name='cmsbackoffice' />
    <extension name='previewpersonalizationweb' />
    <extension name='personalizationcmsweb' />
    <extension name='personalizationsmartedit' />
    <extension name='personalizationpromotionssmartedit' />
    <extension name='personalizationsampledataaddon' />
    <extension name='personalizationpromotions' />
    <extension name='personalizationpromotionsweb' />
    <extension name='personalizationservicesbackoffice' />
    <extension name='personalizationpromotionsbackoffice' />
    <extension name='personalizationcmsbackoffice' />
    <extension name='personalizationsearchbackoffice' />
    <extension name='personalizationsearchsmartedit' />
    <extension name='personalizationsearchweb' />
    <extension name='personalizationsearchsamplesaddon' />
    <extension name='textfieldconfiguratortemplatebackoffice' />
    <extension name='textfieldconfiguratortemplateaddon' />
    <extension name='assistedservicestorefront' />
    <extension name='assistedservicewebservices' />
    <extension name='assistedservicepromotionaddon' />
    <extension name='assistedserviceatddtests' />
    <extension name='promotionengineatddtests' />
    <extension name='textfieldconfiguratortemplateatddtests' />
    <extension name='pcmbackoffice' />
    <extension name='chineseprofileaddon' />
    <extension name='chineselogisticaddon' />
    <extension name='chineselogisticbackoffice' />
    <extension name='chinesepaymentaddon' />
    <extension name='chinesetaxinvoiceaddon' />
    <extension name='chinesetaxinvoicebackoffice' />
    <extension name='chinesepspalipaymock' />
    <extension name='chinesepspalipaysamplesaddon' />
    <extension name='chinesepspalipaysbackoffice' />
    <extension name='chinesestoreaddon' />
    <extension name='verticalnavigationaddon' />
    <extension name='chineseaddressaddon' />
    <extension name='chineseaddressbackoffice' />
    <extension name='chinesepspwechatpaymentaddon' />
    <extension name='chinesepspwechatpaysamplesaddon' />
    <extension name='chinesepspwechatpaysbackoffice' />
    <extension name='consignmenttrackingaddon' />
    <extension name='consignmenttrackingmock' />
    <extension name='consignmenttrackingbackoffice' />
    <extension name='notificationaddon' />
    <extension name='customerinterestsaddon' />
    <extension name='stocknotificationaddon' />
    <extension name='chineseproductsharingaddon' />
    <extension name='selectivecartaddon' />
    <extension name='customercouponaddon' />
    <extension name='customercouponsamplesaddon' />
    <extension name='customercouponbackoffice' />
    <extension name='timedaccesspromotionengineaddon' />
    <extension name='timedaccesspromotionenginesamplesaddon' />
    <extension name='timedaccesspromotionenginebackoffice' />
    <extension name='messagecentercsoccaddon' />
    <extension name='consignmenttrackingoccaddon' />
    <extension name='customerinterestsoccaddon' />
    <extension name='customercouponoccaddon' />
    <extension name='notificationoccaddon' />
    <extension name='stocknotificationoccaddon' />
  </extensions>
</hybrisconfig>

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