What does this mean?
<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
It can be seen in Strings.xml as part of the resources folder values in Android projects.
This is xml namespace used for xliff. Xliff is used for localization purposes. You can read more about xliff here.
XLIFF is the OASIS XML Localisation Interchange File Format.
xmlns:xliff is an XML attribute name. The :xliff indicates we are using the xliff namespace.
urn:oasis:names:tc:xliff:document:1.2 identifies the schema location; the choice of format is at the discretion of Oasis, I'd assume it has meaning.
来源：https://stackoverflow.com/questions/6158157/what-does-this-mean-xmlnsxliff-xml