Re: Do not use the same tag name for different things ...Do yo

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From: David Carlisle <d.p.carlisle@g...>
To: Roger L Costello <costello@m...>
Date: Fri, 21 Jan 2022 17:36:43 +0000

<Items>
<Aquarium>
<Tank>40 gallon capacity</Tank>
</Aquarium>
<Abrams>
<Tank>M-1A2C</Tank>
</Abrams>

</Items>

is valid against

start = items

items = element Items {thing*}

thing = ( pet-house | vehicle )

pet-house = aquarium

aquarium = element Aquarium { fish-tank }

# add more pet houses here

fish-tank = element Tank {text}

vehicle = abrams

# add more vehicles here

abrams = element Abrams { battle-tank }

battle-tank = element Tank {text}

On Fri, 21 Jan 2022 at 17:06, Roger L Costello <costello@m...> wrote:

David Carlisle wrote (paraphrasing):

> The fact that you cannot have two different global declarations
> of a Tank element is a limitation of XML Schemas. Other
> constraint languages do not have the limitation.

Wow!

> If you use Relax NG you can globally declare tank-fish and
> tank-military patterns that both use the same element name,
> but each used in their respective contexts.

Wow!

I haven't done anything with Relax NG for a long time. Would someone show Relax NG code that creates two "Tank" elements (an aquarium tank and a military tank) without violating DRY (Don't Repeat Yourself), please?

/Roger

References:
- Re: Do not use the same tag name for different things ...Do you agree?
  - From: Roger L Costello <costello@m...>

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