Is it possible to define an XML attribute for an element by an additional XSD?

[muderui]

Let's say I have an XML something like this:\[code\]<root xmlns="default" xmlns:add="additional"> <element foo="fromDefault" /> <add:element foo="fromDefault" add:bar="fromAdditional" /></root>\[/code\]What I would like to do is to merge the two \[code\]element\[/code\] definitions to avoid duplications, something like this:\[code\]<root xmlns="default" xmlns:add="additional"> <element foo="fromDefault" add:bar="fromAdditional" /></root>\[/code\]But I'm not even sure if this is possible.I have the feeling it might be doable because we use some similar notations for the root elements like:\[code\]<root xmlns:xsi="..." xsi:schemaLocation="...">\[/code\]Unfortunately I wasn't able to find any docs/references/tutorials/anything about this issue, could someone help me clarify if what I would like to do is possible (or not) and share some links with me?Thanks in advance!