Classes to represent a KGML Pathway Map.

The KGML definition is as of release KGML v0.7.1 (http://www.kegg.jp/kegg/xml/docs/)

Classes:

• Pathway - Specifies graph information for the pathway map
• Relation - Specifies a relationship between two proteins or KOs, or protein and compound. There is an implied direction to the relationship in some cases.
• Reaction - A specific chemical reaction between a substrate and a product.
• Entry - A node in the pathway graph
• Graphics - Entry subelement describing its visual representation