DTD para SIPs

<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT project-record (meta,workteam,abstract,deliverables) >

<!ELEMENT meta (keyname,title,subtitle?,begindate?,enddate,supervisor) >

<!ELEMENT keyname (#PCDATA)>
<!ELEMENT title (#PCDATA)>
<!ELEMENT subtitle (#PCDATA)>
<!ELEMENT begindate (#PCDATA)>
<!ELEMENT enddate (#PCDATA)>
<!ELEMENT supervisor (name,email?,url?) >

<!ELEMENT member (name, identifier, email) >
<!ELEMENT name (#PCDATA)>
<!ELEMENT identifier (#PCDATA) >
<!ELEMENT email (#PCDATA)>
<!ELEMENT url (#PCDATA)>

<!ELEMENT workteam (member)+ >

<!ELEMENT abstract (p+) >
<!ELEMENT p (#PCDATA|xref|b|i)* >

<!ELEMENT xref (#PCDATA) >
<!ATTLIST xref
            url CDATA #REQUIRED>

<!ELEMENT b (#PCDATA|i)* >
<!ELEMENT i (#PCDATA|b)* >

<!ELEMENT file (#PCDATA)>
<!ATTLIST file
            path CDATA #REQUIRED
            format CDATA #IMPLIED>
<!ELEMENT deliverables (file)+ >