Here's another take on a DTD. It's similar to what Devin has with the addition of a System and a Surveys
block. This is by no means complete. Just taking a "whack" at things.
<!ELEMENT CaveXML (System | Cave)>
<!-- A file can contain a survey with many caves or a single cave -->
<!ATTLIST CaveXML
Version CDATA #REQUIRED
Source CDATA #IMPLIED>
<!-- Version will hold the CaveXML release version this file used.-->
<!-- Source will hold information from a data conversion. Some values
could be: SMAPS, CMAP, Karst, COMPASS, OnStation, Survex. -->
<!ELEMENT System (Cave+)>
<!-- A system is made up of one or more Caves -->
<!ELEMENT Cave (Entrance?, Surveys)>
<!ATTLIST Cave Name CDATA>
<!ELEMENT Entrance Location>
<!ATTLIST Entrance station IDREF #IMPLIED>
<!-- This is the entrance station used for tying the cave to coordinate data.-->
<!ELEMENT Location EMPTY>
<!-- This would hold the coordinates in either GPS or Lat/Long for the entrance station -->
<!ELEMENT Surveys (Survey+)>
<!-- This is the section were raw survey data is held. If other information is necessary,
it can be added via another section (ie. Inventories, Pictures, etc). -->
<!ELEMENT Survey EMPTY>
<!-- The raw survey data -->
- Richard Knapp
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This archive was generated by hypermail 2b30 : Mon Apr 02 2001 - 18:00:00 CEST