Namespace Mistake?

I don't recall my specific reasons now but I have been reusing a namespace prefix in schemas and instance data 'mlhim2' to reference different versions of a schema reference model. 

For example:

xmlns:mlhim2="http://www.mlhim.org/xmlns/mlhim2/2_4_1"  in one version of the schema and instance data and then  xmlns:mlhim2="http://www.mlhim.org/xmlns/mlhim2/2_4_2" in another version of the schema and instance data. 

Now I think this is a mistake when I need to have multiple versions of instance data in a single database and run queries across them.  

Should I change to start using:

xmlns:mlhim241="http://www.mlhim.org/xmlns/mlhim2/2_4_1" and xmlns:mlhim242="http://www.mlhim.org/xmlns/mlhim2/2_4_2"

to be more explicit and avoid any problems?

Thanks In Advance,

Tim

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