<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT Refsbook (Docinfo, Author, Reference+)>
<!ELEMENT Docinfo (Date, Source)>
<!ELEMENT Author (Name, Email, About, External_id+)>

<!ELEMENT Reference (Title, Url, Description, Category, Thumb_url)>

<!ELEMENT Date (#PCDATA)>
<!ELEMENT Source (#PCDATA)>

<!ELEMENT Name (#PCDATA)>
<!ELEMENT Email (#PCDATA)>
<!ELEMENT About (#PCDATA)>

<!ELEMENT External_id EMPTY>
<!ATTLIST External_id location CDATA #REQUIRED 
						value CDATA #REQUIRED>

<!ELEMENT Title (#PCDATA)>
<!ELEMENT Url (#PCDATA)>
<!ELEMENT Thumb_url (#PCDATA)>
<!ELEMENT Description (#PCDATA)>
<!ELEMENT Category (#PCDATA)>

<!ENTITY AUTHOR "Mirek Grabovsky">
<!ENTITY WEB    "http://www.refsbook.com">
<!ENTITY EMAIL  "brundibar@centrum.cz">
<!ENTITY VERSION "1.0">