This is the current Openkey dtd at UIUC as of November 2002
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<!--This is the fourth version of the Plant Description DTD.  This version includes revisions made according to Stephen Sieberling's updated matrix.  This also includes notes regarding acceptable values for some of the elements.  (If this is helpful, I will include it for all elements).-->
<!ELEMENT Plant_Description (global_ID_number , special_diagnostic_characters , habitat , Taxon , plant_habit_and_life_style , stems , leaves , flowers_cones , Fruits_Cones_Seeds , other_features)>

<!ELEMENT plant_habit_and_life_style (life_span , woodiness , growth_habit , growth_form , plant_height_when_mature , nutrition , carnivory)>

<!ELEMENT stems (stem_types , stem_surface_features , pith)>

<!ELEMENT leaves (leaf_duration , leaf_length , leaflet_length , leaf_width , leaflet_width , leaf_arrangement , leaf_complexity , leaf_shape , leaflet_shape , leaf_veins , leaflet_veins , leaf_margin , leaflet_margin , leaf_lobing , leaflet_lobing , leaf_base , leaflet_base , leaf_attachment , leaflet_attachment , leaf_apex , leaflet_apex , stipules , leaf_upper_surface , leaf_lower_surface , petiole_surface , rachis_surface , leaf_buds)>

<!ELEMENT flowers_cones (bloom_time? , flower_attachment? , inflorescence_position? , inflorescence? , breeding_system* , flower_symmetry? , flower_buds? , petal_color* , petal_number? , petal_fusion? , petal_length? , sepal_color* , sepal_number? , sepal_fusion? , sepal_length? , position_of_ovary? , stamen_number? , pistil_number? , styles_per_pistil? , placentation?)>

<!ELEMENT Fruits_Cones_Seeds (fruit_type , seeds)>

<!--#DOCUMENTATION:values include: WOODY PLANT, HERBACEOUS PLANT-->
<!ELEMENT woodiness (#PCDATA)>

<!--#DOCUMENTATION:values include: BROAD LEAF HERBACEOUS, GRASSLIKE HERBACEOUS, SHRUB, TREE, VINE, SUBSHRUB, TRAILING SHRUB, SUCCULENT-LEAFLESS, AQUATIC-FLOATING, AQUATIC-SUBMERGED, AQUATIC-EMERGENT, EPIPHYTIC, GRAMINOID-->
<!ELEMENT growth_habit (#PCDATA)>

<!--#DOCUMENTATION:values include: AUTOTROPHIC, PARASITIC, SEMI-PARASITIC, SAPROPHYTIC-->
<!ELEMENT nutrition (#PCDATA)>

<!--#DOCUMENTATION:values include: CARNIVOROUS, NOT CARNIVOROUS-->
<!ELEMENT carnivory (#PCDATA)>

<!--#DOCUMENTATION:values include: PERENNIAL, ANNUAL, BIENNIAL-->
<!ELEMENT life_span (#PCDATA)>

<!ELEMENT plant_height_when_mature (#PCDATA)>

<!--#DOCUMENTATION:values include: AERIAL STEM, RHIZOME, STOLON, BULB, CORM, TUBER-->
<!ELEMENT stem_types (#PCDATA)>

<!--#DOCUMENTATION:values include: CONTINUOUS, CHAMBERED, DIAPHRAGMED-->
<!ELEMENT pith (#PCDATA)>

<!--#DOCUMENTATION:values include: GLABROUS, PUBESCENT, PILOSE, VILLOUS, STRIGOSE, HIRSUTE, HISPID, SCABROUS, TOMENTOSE, PUBERULENT, STELLATE, GLANDULAR, PUNCTATE, GLAUCOUS, SPINY, PRICKLY, THORNY, NECTARY BEARING, -->
<!ELEMENT stem_surface_features (#PCDATA)>

<!--#DOCUMENTATION:values include: EVERGREEN, DECIDUOUS-->
<!ELEMENT leaf_duration (#PCDATA)>

<!--#DOCUMENTATION:values include: ALTERNATE, OPPOSITE, WHORLED, BASAL, CAULINE-->
<!ELEMENT leaf_arrangement (#PCDATA)>

<!ELEMENT leaf_complexity (#PCDATA)>

<!ELEMENT leaf_attachment (#PCDATA)>

<!ELEMENT leaflet_attachment (#PCDATA)>

<!ELEMENT stipules (#PCDATA)>

<!ELEMENT leaf_upper_surface (#PCDATA)>

<!ELEMENT leaf_lower_surface (#PCDATA)>

<!ELEMENT petiole_surface (#PCDATA)>

<!ELEMENT rachis_surface (#PCDATA)>

<!ELEMENT inflorescence (#PCDATA)>

<!ELEMENT breeding_system (#PCDATA)>

<!ELEMENT flower_symmetry (#PCDATA)>

<!ELEMENT petal_fusion (#PCDATA)>

<!ELEMENT petal_number (#PCDATA)>

<!ELEMENT petal_length (#PCDATA)>

<!ELEMENT sepal_fusion (#PCDATA)>

<!ELEMENT sepal_number (#PCDATA)>

<!ELEMENT sepal_length (#PCDATA)>

<!ELEMENT position_of_ovary (#PCDATA)>

<!ELEMENT placentation (#PCDATA)>

<!ELEMENT styles_per_pistil (#PCDATA)>

<!ELEMENT inflorescence_position (#PCDATA)>

<!ELEMENT fruit_type (#PCDATA)>

<!ELEMENT seeds (#PCDATA)>

<!--#DOCUMENTATION:The "Taxon" grouping is recursive in that, for a given plant, a Rank, Name, Authority, etc., may be recorded for each level of the taxonomic hierarchy. Each rank is contained within the rank(s) above it, with the exception that infraspecific ranks (Subspecies, Variety and Form) are not required to be in a hierarchical relationship to one another (i.e. a Form does not have to be contained within a Variety or Subspecies, nor does a Variety need to be contained within a Subspecies)-->
<!ELEMENT Taxon (Rank , Name , Authority , Vernacular+ , Synonym* , ParentTaxon? , ChildTaxon*)>

<!ELEMENT Name (#PCDATA)>

<!ELEMENT Authority (#PCDATA)>

<!ELEMENT Vernacular (#PCDATA)>

<!ELEMENT global_ID_number (#PCDATA)>

<!ELEMENT special_diagnostic_characters (#PCDATA)>

<!--#DOCUMENTATION:values include PRAIRIE, FOREST, MIXED EDGE-->
<!ELEMENT habitat (#PCDATA)>

<!--#DOCUMENTATION:values include: BUNCHING, SINGLE UPRIGHT STEM-->
<!ELEMENT growth_form (#PCDATA)>

<!ELEMENT leaf_length (#PCDATA)>

<!ELEMENT leaflet_length (#PCDATA)>

<!ELEMENT leaf_width (#PCDATA)>

<!ELEMENT leaflet_width (#PCDATA)>

<!ELEMENT leaf_shape (#PCDATA)>

<!ELEMENT leaflet_shape (#PCDATA)>

<!ELEMENT leaf_veins (#PCDATA)>

<!ELEMENT leaflet_veins (#PCDATA)>

<!ELEMENT leaf_margin (#PCDATA)>

<!ELEMENT leaflet_margin (#PCDATA)>

<!ELEMENT leaf_lobing (#PCDATA)>

<!ELEMENT leaflet_lobing (#PCDATA)>

<!ELEMENT leaf_base (#PCDATA)>

<!ELEMENT leaflet_base (#PCDATA)>

<!--leaf_apex element refers to the leaf tip-->
<!ELEMENT leaf_apex (#PCDATA)>

<!--leaflet_apex element refers to the leaflet tip-->
<!ELEMENT leaflet_apex (#PCDATA)>

<!ELEMENT bloom_time (#PCDATA)>

<!ELEMENT flower_attachment (#PCDATA)>

<!ELEMENT flower_buds (#PCDATA)>

<!ELEMENT petal_color (#PCDATA)>

<!ELEMENT sepal_color (#PCDATA)>

<!ELEMENT stamen_number (#PCDATA)>

<!ELEMENT pistil_number (#PCDATA)>

<!ELEMENT other_features (root_type)>

<!ELEMENT root_type (#PCDATA)>

<!--#DOCUMENTATION:Values include KINGDOM, SUBKINGDOM, DIVISION, CLASS, ORDER, FAMILY, GENUS, SPECIES, SUBSPECIES, VARIETY, FORM-->
<!ELEMENT Rank (#PCDATA)>

<!--#DOCUMENTATION:This element is only used for SPECIES level or below-->
<!ELEMENT Synonym (#PCDATA)>

<!ELEMENT ParentTaxon (#PCDATA)>

<!ELEMENT ChildTaxon (#PCDATA)>

<!ELEMENT leaf_bud (#PCDATA)>

<!ELEMENT leaf_buds (#PCDATA)>