<!ELEMENT gallery (galleryName, folderName, images)>
<!ELEMENT galleryName (#PCDATA)>
<!ELEMENT folderName (#PCDATA)>

<!ELEMENT images (image*)>
<!ELEMENT image (filename, title, description, people, keywords, date, physical)>
<!ELEMENT filename (#PCDATA)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT description (#PCDATA)>

<!ELEMENT people (personID*)>
<!ELEMENT personID (#PCDATA)>

<!ELEMENT keywords (keyword*)>
<!ELEMENT keyword (#PCDATA)>

<!ELEMENT date (month, year)>
<!ELEMENT month (#PCDATA)>
<!ELEMENT year (#PCDATA)>

<!ELEMENT physical (width?, height?)>
<!ELEMENT width (#PCDATA)>
<!ELEMENT height (#PCDATA)>