Dreamweaver had support for XML to HTML, but the function was removed. What should I now use? Will the function return?
I never used that feature but if memory serves me it was added to the deprecated features list in CC 2013. Dreamweaver Help | Removed features - Part II | Dreamweaver CC
You could revert to CS6 -- the last version to have it.
Log-in to Creative Cloud Desktop.
Click Apps > ALL APPS
Scroll down & click on PREVIOUS VERSION.
You should see CS6 in the drop-list.
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