sites_dtd
1| <!ELEMENT sites (browser1, browser2?, browser3?, site+)>
2| <!ELEMENT browser1 (#PCDATA)>
3| <!ELEMENT browser2 (#PCDATA)>
4| <!ELEMENT browser3 (#PCDATA)>
5| <!ELEMENT site (browser, url, description, password?)>
6| <!ELEMENT browser (#PCDATA)>
7| <!ELEMENT url (#PCDATA)>
8| <!ELEMENT description (#PCDATA)>
9| <!ELEMENT password (#PCDATA)>