Chapter 24, Problem 17RE

Explanation of Solution

DTD for simple English sentences:

<!--Defining the sentence as root element-->

<!DOCTYPE sentence [

<!--Defining child element for sentence-->

<!ELEMENT sentence (noun-phrase, verb, noun-phrase)>

<!--Expanding noun-phase element-->

<!ELEMENT noun-phrase (article, adjective-list, noun)>

<!--Declaring data type for article-->

<!ELEMENT article (#PCDATA)>

<!--Checking adjective in the adjective-list-->

<!ELEMENT adjective-list (adjective, adjective-list?) >

<!--Declaring text data type for adjective, noun, and verb -->

<!ELEMENT adjective (#PCDATA)>