phy:Date 

A date associated with a clade/node. Its value can be numerical by using
the 'value' element and/or free text with the 'desc' element' (e.g. 'Silurian'). If a
numerical value is used, it is recommended to employ the 'unit' attribute to indicate
the type of the numerical value (e.g. 'mya' for 'million years ago'). The elements
'minimum' and 'maximum' are used the indicate a range/confidence
interval

Complex Type Information

Model

phy:desc{0,1} , phy:value{0,1} , phy:minimum{0,1} , phy:maximum{0,1}
Children: phy:desc, phy:maximum, phy:minimum, phy:value

Attributes

QName Type Fixed Default Use Inheritable Annotation
unit xs:token optional

Used By

Element phy:Clade/phy:date

Source 

<xs:complexType name="Date">
  <xs:annotation>
    <xs:documentation>A date associated with a clade/node. Its value can be numerical by using the 'value' element and/or free text with the 'desc' element' (e.g. 'Silurian'). If a numerical value is used, it is recommended to employ the 'unit' attribute to indicate the type of the numerical value (e.g. 'mya' for 'million years ago'). The elements 'minimum' and 'maximum' are used the indicate a range/confidence interval</xs:documentation>
  </xs:annotation>
  <xs:sequence>
    <xs:element name="desc" type="xs:token" minOccurs="0"/>
    <xs:element name="value" type="xs:decimal" minOccurs="0"/>
    <xs:element name="minimum" type="xs:decimal" minOccurs="0"/>
    <xs:element name="maximum" type="xs:decimal" minOccurs="0"/>
  </xs:sequence>
  <xs:attribute name="unit" type="xs:token"/>
</xs:complexType>