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Asked: 2026-05-11T01:50:18+00:00

For my assignment I have been assigned the task of creating a DTD for

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For my assignment I have been assigned the task of creating a DTD for representing a virtual-geocaching game.

I am having a problem representing the location which can be either gps or wifi or both but not more then one of each. How would i represent this? The closest I could think of is listed below.

<!ELEMENT location ((gps|wifi)+)>

The full DTD is here.

<!ELEMENT game (information, caches)>     <!ELEMENT information (gameID, gameName, gameDescription, date, author)>         <!ELEMENT gameID (#PCDATA)>         <!ELEMENT gameName (#PCDATA)>         <!ELEMENT gameDescription (#PCDATA)>         <!ELEMENT date (#PCDATA)>         <!ELEMENT author (#PCDATA)>     <!ELEMENT caches (cache+)>         <!ELEMENT cache (cacheID, cacheName, location, value)>             <!ELEMENT cacheID (#PCDATA)>             <!ELEMENT cacheName (#PCDATA)>             <!ELEMENT location ((gps|wifi)+)>                 <!ELEMENT gps (longitude, latitude)>                     <!ELEMENT latitude (#PCDATA)>                     <!ELEMENT longitude (#PCDATA)>                 <!ELEMENT wifi (#PCDATA)>             <!ELEMENT value (#PCDATA)>

Where each game contains some information about it and a number of caches.

Cheers in advance.

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1 Answer

  1. Try this:

    <!ELEMENT location ((gps|wifi|(gps,wifi)|(wifi,gps)))>
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