<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT stream (object+, objects*, xdesc*, zdesc*)>
<!ELEMENT object (ids, (gridvalue|remove))>
<!ELEMENT objects (ids, gridvalue+)>
<!ELEMENT gridvalue (idx, idz, value)>
<!ELEMENT xdesc (id, desc)>
<!ELEMENT zdesc (id, desc)>
<!ELEMENT id (#PCDATA)>
<!ELEMENT ids (#PCDATA)>
<!ELEMENT idx (#PCDATA)>
<!ELEMENT idz (#PCDATA)>
<!ELEMENT value (#PCDATA)>
<!ELEMENT desc (#PCDATA)>
<!ELEMENT remove EMPTY>