fix: include namespace in combined package

README.md

@@ -4,7 +4,7 @@
 
 A Salesforce CLI plugin to combine multiple manifest files (package.xml) into 1 file that can be used for deployments.
 
-**NOTE:** When the packages are combined, the `<name>` tags with the metadata name will be converted to lower-case, ex: `<name>customobject</name>`. This ensures that multiple members of the same metadata name are grouped together in the combined package. The `<name>` tags are case insensitive when read by the Salesforce CLI. However, the `<members>` tags are case sensitive and must match the cases to match their API names in Salesforce. This tool will not convert the `<members>` cases, just the `<name`> tags.
+When the packages are combined, the `<name>` tags with the metadata name will be converted to lower-case, ex: `<name>customobject</name>`. This ensures that multiple members of the same metadata name are grouped together in the combined package. The `<name>` tags are case insensitive when read by the Salesforce CLI. However, the `<members>` tags are case sensitive and must match the cases to match their API names in Salesforce. This tool will not convert the `<members>` cases, just the `<name>` tags.
 
 The combined package.xml will use the maximum `<version>` tag found in all packages. If none of the packages provided have `<version>`, it will omit this from the combined package.xml. When you deploy a package.xml without an API version, it will check the `sfdx-project.json` file for the `sourceApiVersion`. If both files do not have an API version, it will default to the max API version available in the target org.
 
@@ -31,12 +31,13 @@ USAGE
 FLAGS
   -f, --package-file=<value> The path to an existing package.xml file. This flag can be specified multiple times.
   -c, --combined-package=<value> The path to save the combined package.xml to.
+                                 Default name is "combinedPackage.xml" in the running directory.
 
 GLOBAL FLAGS
   --json  Format output as json.
 
 DESCRIPTION
-  Combine multiple package files into 1 singular package file.
+  Combine multiple package files into 1 file.
 
 EXAMPLES
   Combine pack1.xml and pack2.xml into package.xml

src/commands/sfpc/combine.ts

@@ -87,7 +87,9 @@ export default class SfpcCombine extends SfCommand<SfpcCombineResult> {
       }
     }
 
-    const root = create({ version: '1.0', encoding: 'UTF-8' }).ele('Package');
+    const root = create({ version: '1.0', encoding: 'UTF-8' }).ele('Package', {
+      xmlns: 'http://soap.sforce.com/2006/04/metadata',
+    });
 
     // Create <types> for each type, properly formatting the XML
     mergedPackage.Package.types.forEach((type) => {

test/samples/combinedPackage.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<Package>
+<Package xmlns="http://soap.sforce.com/2006/04/metadata">
   <types>
     <members>Account</members>
     <members>Case</members>