<!ELEMENT plants (plant)*>
<!ELEMENT plant (flower, name)>
<!ELEMENT flower (#PCDATA)>
<!ELEMENT name (#PCDATA)>
<!ATTLIST flower colour CDATA #IMPLIED>
<!ELEMENT plants (plant)*>
<!ELEMENT plant (flower, name)>
<!ELEMENT flower (#PCDATA)>
<!ELEMENT name (#PCDATA)>
<!ATTLIST flower colour CDATA #IMPLIED>