An XML file merger, merges multiple files to one.
$ XmlMerger.exe . output.xml
or
$ XmlMerger.exe "C:\Long Path\To\XML-files" superoutput.xml
fileA.xml:
<?xml version="1.0"?>
<root>
<entry>
<Description>Test</Description>
<Date>2019-05-17</Date>
</entry>
</root>
fileB.xml:
<?xml version="1.0"?>
<root>
<entry>
<Description>Test</Description>
<Date>2019-05-18</Date>
<ExtraEntry>Content</ExtraEntry>
</entry>
</root>
Merge 'em together.
$ XmlMerger.exe . output.xml
Creates output.xml:
<?xml version="1.0"?>
<root>
<entry>
<Description>Test</Description>
<Date>2019-05-17</Date>
</entry>
<entry>
<Description>Test</Description>
<Date>2019-05-18</Date>
<ExtraEntry>Content</ExtraEntry>
</entry>
</root>