Hi @davidalvarez76
This should be fairly straightforward. You just need to write the data to a LandXML output. However... you must also add metadata information else the output will fail the validation.
So, check out this article. Open the workspace it contains and copy its components into your workspace. Then make sure the feature types are moved into your writer. Now run the workspace. It should produce a valid output.
I can't confirm the output is valid because when I upload my data it crashes the web site! But that might be their web issue rather than my data (I'm hoping it's because my data is outside of their expected boundaries) and you might have more luck.
Hope this helps
Mark