Topic
- Use SalesforceXytoolsForSublime To Build package.xml
 
There are 2 ways to build package.xml 1. Build From SFDC API. 2. Use local file to build package.xml.
Build package.xml From Server
Sublime-Menu :SFDC-XY > Package Builder > Build Package.xml From Server

You can build package.xml like below.
<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
    <types>
        <members>*</members>
        <name>InstalledPackage</name>
    </types>
    <types>
        <members>*</members>
        <name>CustomLabels</name>
    </types>
    <types>
        <members>*</members>
        <name>StaticResource</name>
    </types>
   ............
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    <types>
        <members>*</members>
        <name>Settings</name>
    </types>
    <version>42.0</version>
</Package>
Build package.xml From Open Files
Example, Open Account.object,Blog.page,BlogController.cls,Blog__c.object in Sublime

Sublime-Menu : SFDC-XY > Package Builder > Build package.xml From Open Files
You can build package.xml like below.
<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
    <types>
        <members>Blog</members>
        <name>ApexPage</name>
    </types>
    <types>
        <members>BlogController</members>
        <name>ApexClass</name>
    </types>
    <types>
        <members>Account</members>
        <members>Blog__c</members>
        <name>CustomObject</name>
    </types>
    <version>42.0</version>
</Package>
Summary
Package Builder
Build Package.xml From Server
Package Builder > Build Package.xml From Server
Export all package.xml from server
Build Package.xml From Server From Open Files
Package Builder > Build Package.xml From Open Files
Build The deploy package from open files
Package Builder > Build Deploy Package From Open Files
This is only copy the open files to a dir, not deploy to server.