This code defines an XML Schema Definition (XSD) used to...

August 22, 2025 at 08:36 PM

<?xml version="1.0" encoding="UTF-8" ?>
<schema targetNamespace="http://schemas.microsoft.com/wsus/2005/04/CorporatePublishing/Installers/MsiInstallation.xsd"
    xmlns:bt="http://schemas.microsoft.com/wsus/2005/04/CorporatePublishing/BaseTypes.xsd"
    xmlns:msi="http://schemas.microsoft.com/wsus/2005/04/CorporatePublishing/Installers/MsiInstallation.xsd"
    xmlns:sdp="http://schemas.microsoft.com/wsus/2005/04/CorporatePublishing/SoftwareDistributionPackage.xsd"
    xmlns:mspblob="http://www.microsoft.com/msi/patch_applicability.xsd"
    xmlns="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
    <!--
        Data specific to MSI installation 
    -->
    
    <simpleType name="MsiInstallerCommandLine">
        <annotation>
            <documentation>An optional command line to be passed to MSI when installing, specified as space-separated name=value pairs.</documentation>
        </annotation>
        <restriction base="string">
            <maxLength value="32768" />
            <minLength value="1" />
        </restriction>
    </simpleType>
    <element name="MsiInstallerData" substitutionGroup="sdp:InstallHandlerSpecificData">
        <complexType>
            <annotation>
                <documentation>Data specific to MSI packages.</documentation>
            </annotation>
            <attribute name="CommandLine" type="msi:MsiInstallerCommandLine" use="optional">
                <annotation>
                    <documentation>Optional "command line" that is passed to the MSI APIs when installing the product. This will typically contain extra properties as name-value pairs separated by spaces.</documentation>
                </annotation>
            </attribute>
            <attribute name="UninstallCommandLine" type="msi:MsiInstallerCommandLine" use="optional">
                <annotation>
                    <documentation>Optional uninstall "command line" that is passed to the MSI APIs when uninstalling the product.  This will typically contain extra properties as name-value pairs separated by spaces.</documentation>
                </annotation>
            </attribute>
            <attribute name="MsiFile" type="bt:FilePath" use="required">
                <annotation>
                    <documentation>The name of the MSI file to install, specified as a filename such as FILENAME.MSI, and may include an optional relative path.  The Client will download (and decompress) the files required for installation (if any) into a temporary directory, and then execute the program via Win32 CreateProcess.  This attribute specifies the file within the temporary directory to execute.  If the decompression results in subdirectories within the temporary directory, the file to execute may be within on of those subdirectories and the relative path should include that subdirectory.  Note that this means that only files within the temporary directory may be executed so the executable must be included in the files download from the server.</documentation>
                </annotation>
            </attribute>
            <attribute name="ProductCode" type="mspblob:GUID" use="required">
                <annotation>
                    <documentation>ProductCode of the MSI to be applied.</documentation>
                </annotation>
            </attribute>
        </complexType>
    </element>
</schema>

This code defines an XML Schema Definition (XSD) used to describe the structure and constraints for data related to MSI (Windows Installer) installations in a corporate software distribution system. Here's what it does in more detail:

Namespace Declaration:
- Defines the namespaces for various elements that may be used in the schema (e.g., bt, msi, sdp, etc.), providing organizational or semantic segmentation.
- The target namespace (http://schemas.microsoft.com/wsus/2005/04/CorporatePublishing/Installers/MsiInstallation.xsd) suggests it is specific to Windows Server Update Services (WSUS) for distributing software in a corporate setting.
Simple Type:
- MsiInstallerCommandLine:
  - A custom simpleType is defined to represent a command line string for the MSI installation process.
  - The maxLength is constrained to 32,768 characters, and the minLength requires at least one character.
  - Includes documentation that specifies its purpose as passing optional command-line arguments to the MSI installer.
Element Definition:
- MsiInstallerData:
  - Declares a complex type to hold data specific to MSI installation packages.
  - Identified as a child of sdp:InstallHandlerSpecificData via the attribute substitutionGroup.
Attributes:
- Describes data attributes for the MsiInstallerData element:
  - CommandLine: Optional command line for installing the MSI (space-separated name=value pairs).
  - UninstallCommandLine: Optional command line for uninstalling the MSI.
  - MsiFile: Required attribute specifying the MSI file to install, including its filename or a relative path. Describes the process of downloading/decompressing files into a temporary directory and executing them.
  - ProductCode: Required unique identifier (GUID) for the MSI installation package, defined using a type from mspblob.
Documentation:
- Provides human-readable descriptions via <annotation> and <documentation> tags. These describe the purpose and constraints of the element, types, and attributes. This makes it easier for developers or automated processes to understand and use the schema.
Purpose:
- This schema enforces constraints and describes the metadata required to install or uninstall an MSI package using WSUS or a similar corporate software deployment mechanism.
- It specifies rules for attributes such as file paths, command-line arguments, and product identification for MSI packages.

In essence, this XSD systematically defines the rules and structure for handling MSI installation data within a controlled distribution framework.

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