Let's look at a minimal example of package.xml file:
<package type="addon" name="nuxeo-automation" version="5.3.2">
<title>Nuxeo Automation</title>
<description>A service that enables building complex business logic on top of Nuxeo services
using scriptable operation chains</description>
<platforms>
<platform>dm-5.3.2</platform>
<platform>dam-5.3.2</platform>
</platforms>
</package>
This is a minimal package manifest. It is defining a package nuxeo-automation at version 5.3.2 and of type add-on. The package can be installed on platforms dm-5.3.2 and dam-5.3.2.
TODO: replace fixed versions in platforms with range of versions.
Also, the package title and description that should be used by the UI are specified vy the title and description elements.
Note that the package names used in these examples are fictional.
Lets look at the full version of the same package manifest:
<package type="addon" name="nuxeo-automation" version="5.3.2">
<title>Nuxeo Automation</title>
<description>A service that enables building complex business logic on top of Nuxeo services
using scriptable operation chains</description>
<classifier>Open Source</classifier>
<home-page>http://some.host.com/mypage</home-page>
<vendor>Nuxeo</vendor>
<installer class="org.nuxeo.connect.update.impl.task.InstallTask" restart="false"/>
<uninstaller class="org.nuxeo.connect.update.impl.task.UninstallTask" restart="false"/>
<validator class="org.nuxeo.MyValidator"/>
<platforms>
<platform>dm-5.3.2</platform>
<platform>dam-5.3.2</platform>
</platforms>
<dependencies>
<package>nuxeo-core:5.3.1:5.3.2</package>
<package>nuxeo-runtime:5.3.1</package>
</dependencies>
<vendor>YourCompany</vendor>
<supported>false</supported>
<hotreload-support>true</hotreload-support>
<require-terms-and-conditions-acceptance>false</require-terms-and-conditions-acceptance>
<NuxeoValidationState>primary_validation</NuxeoValidationState>
<ProductionState>production_ready</ProductionState>
<license>LGPL</license>
<license-url>http://www.gnu.org/licenses/lgpl.html</license-url>
</package>
You can see the usage of installer and uninstaller elements. These are used to specify the task implementation to be used when installing and uninstalling. If these elements are not specified the default values will be used. If you specify only one of the "class" or "restart" attributes, then the other attributes will get the default values.
See Creating Nuxeo Packages for an explanation of each package property.