<?xml  version="1.0" encoding="UTF-8" ?>
<!-- biologykb.dtd -->

<!ELEMENT BIOKB (PROTEIN|GENE|INTERACTION)*>
<!ELEMENT PROTEIN (A-PROTEIN-NAME,A-PROTEIN-LENGTH?,A-PROTEIN-GENE?,A-PROTEIN-INTERACTIONS?)>
<!ELEMENT R-PROTEIN (A-PROTEIN-NAME)>
<!ELEMENT A-PROTEIN-NAME (V-CHAINE)>
<!ELEMENT A-PROTEIN-LENGTH (V-ENTIER)>
<!ELEMENT A-PROTEIN-GENE (R-GENE)>
<!ELEMENT A-PROTEIN-INTERACTIONS (R-INTERACTION+)>

<!ELEMENT GENE (A-GENE-NAME,A-GENE-PROTEIN?)>
<!ELEMENT R-GENE (A-GENE-NAME)>
<!ELEMENT A-GENE-NAME (V-CHAINE)>
<!ELEMENT A-GENE-PROTEIN (R-PROTEIN)>

<!ELEMENT INTERACTION (A-INTERACTION-SRC,A-INTERACTION-TARGET)>
<!ELEMENT R-INTERACTION (A-INTERACTION-SRC,A-INTERACTION-TARGET)>
<!ELEMENT A-INTERACTION-SRC (R-PROTEIN)>
<!ELEMENT A-INTERACTION-TARGET (R-GENE)>

<!-- external types -->
<!ELEMENT V-CHAINE EMPTY>
<!ATTLIST V-CHAINE V CDATA #REQUIRED>
<!ELEMENT V-ENTIER EMPTY>
<!ATTLIST V-ENTIER V CDATA #REQUIRED>