You can also download the dtd
<![CDATA[
<!ELEMENT database (credentials?,entity*,scalar*,row*,rowset*,action*)>
<!ATTLIST database user CDATA #IMPLIED>
<!ATTLIST database password CDATA #IMPLIED>
<!ATTLIST database url CDATA #IMPLIED>
<!ATTLIST database driver CDATA #IMPLIED>
<!ATTLIST database schema CDATA #IMPLIED>
<!ATTLIST database read-only ( yes | no ) "yes">
<!ATTLIST database caching ( none | soft | full ) "none">
<!ATTLIST database reverse ( none | partial | full ) "full">
<!ATTLIST database case ( sensitive | uppercase | lowercase ) #IMPLIED>
<!ATTLIST database loglevel ( trace | debug | info | warn | error ) "info">
<!ATTLIST database min-connections CDATA #IMPLIED>
<!ATTLIST database max-connections CDATA #IMPLIED>
<!ATTLIST database seed CDATA #IMPLIED>
<!ELEMENT credentials>
<!ATTLIST database user CDATA #IMPLIED>
<!ATTLIST database password CDATA #IMPLIED>
<!ATTLIST database url CDATA #IMPLIED>
<!ATTLIST database driver CDATA #IMPLIED>
<!ATTLIST database schema CDATA #IMPLIED>
<!ELEMENT entity (scalar*,row*,rowset*,action*,constraint*)>
<!ATTLIST entity name CDATA #REQUIRED>
<!ATTLIST entity table CDATA #IMPLIED>
<!ATTLIST entity read-only ( yes | no ) "yes">
<!ATTLIST entity class CDATA #IMPLIED>
<!ATTLIST entity caching ( none | soft | full) "none">
<!ATTLIST entity obfuscate CDATA #IMPLIED>
<!ATTLIST entity localized CDATA #IMPLIED>
<!ELEMENT scalar (#PCDATA)> <!-- where #PCDATA is an SQL query with column tags -->
<!ATTLIST scalar name CDATA #REQUIRED>
<!ATTLIST scalar caching CDATA "no">
<!ELEMENT row (#PCDATA)> <!-- where #PCDATA is an SQL query with column tags -->
<!ATTLIST row name CDATA #REQUIRED>
<!ATTLIST row result CDATA #IMPLIED>
<!ATTLIST scalar caching CDATA "no">
<!ELEMENT rowset (#PCDATA)> <!-- where #PCDATA is an SQL query with column tags -->
<!ATTLIST rowset name CDATA #REQUIRED>
<!ATTLIST rowset result CDATA #IMPLIED>
<!ATTLIST scalar caching CDATA "no">
<!ELEMENT imported-key>
<!ATTLIST imported-key name CDATA #REQUIRED>
<!ATTLIST imported-key entity CDATA #REQUIRED>
<!ATTLIST imported-key foreign-cols CDATA #REQUIRED>
<!ELEMENT exported-key>
<!ATTLIST exported-key name CDATA #REQUIRED>
<!ATTLIST exported-key entity CDATA #REQUIRED>
<!ATTLIST exported-key foreign-cols CDATA #REQUIRED>
<!ELEMENT action (#PCDATA)> <!-- where #PCDATA is an SQL query (or a set of queries) with column tags -->
<!ATTLIST action name CDATA #REQUIRED>
<!ELEMENT constraint (email?,min-len?,max-len?,integer?,number?,date?,not-null?,not-empty?,one-of?,reference?,regex?)>
<!ATTLIST constraint column CDATA #REQUIRED>
<!ATTLIST constraint type ( integer | number | date | email ) #IMPLIED>
<!ATTLIST constraint min-len CDATA #IMPLIED>
<!ATTLIST constraint max-men CDATA #IMPLIED>
<!ATTLIST constraint min CDATA #IMPLIED>
<!ATTLIST constraint max CDATA #IMPLIED>
<!ATTLIST constraint after CDATA #IMPLIED>
<!ATTLIST constraint before CDATA #IMPLIED>
<!ATTLIST constraint not-empty CDATA #IMPLIED>
<!ATTLIST constraint not-null CDATA #IMPLIED>
<!ATTLIST constraint one-of CDATA #IMPLIED>
<!ATTLIST constraint reference CDATA #IMPLIED>
<!ATTLIST constraint regex CDATA #IMPLIED>
<!ELEMENT email>
<!ATTLIST email dns-check ( yes | no ) "no">
<!ATTLIST email sptm-check ( yes | no ) "no">
<!ATTLIST email message CDATA #IMPLIED>
<!ELEMENT min-len>
<!ATTLIST min-len value CDATA #REQUIRED>
<!ATTLIST min-len message CDATA #IMPLIED>
<!ELEMENT max-len>
<!ATTLIST max-len value CDATA #REQUIRED>
<!ATTLIST max-len message CDATA #IMPLIED>
<!ELEMENT integer>
<!ATTLIST integer min CDATA #IMPLIED>
<!ATTLIST integer max CDATA #IMPLIED>
<!ATTLIST integer message CDATA #IMPLIED>
<!ELEMENT number>
<!ATTLIST number min CDATA #IMPLIED>
<!ATTLIST number max CDATA #IMPLIED>
<!ATTLIST number message CDATA #IMPLIED>
<!ELEMENT date>
<!ATTLIST date before CDATA #IMPLIED>
<!ATTLIST date after CDATA #IMPLIED>
<!ATTLIST date message CDATA #IMPLIED>
<!ELEMENT not-null>
<!ATTLIST not-null message CDATA #IMPLIED>
<!ELEMENT not-empty>
<!ATTLIST not-empty message CDATA #IMPLIED>
<!ELEMENT one-of (value+)>
<!ATTLIST one-of message CDATA #IMPLIED>
<!ELEMENT value (#PCDATA)>
<!ELEMENT reference>
<!ATTLIST reference foreign-key CDATA #REQUIRED>
<!ATTLIST reference message CDATA #IMPLIED>
<!ELEMENT regex>
<!ATTLIST regex pattern CDATA #REQUIRED>
<!ATTLIST regex message CDATA #IMPLIED>
]]>