
Explanation of Solution
DTD for Invoice:
<!--Declaring invoice DTD-->
<!DOCTYPE invoice [
<!--Declaring invoice element with three attributes-->
<!ELEMENT invoice (number, address, items)>
<!--Declaring number with text data-->
<!ELEMENT number (#PCDATA)>
<!--Expanding the address element with 6 attributes-->
<!ELEMENT address (name, company, street, city, state, zip)>
<!--Declaring name, company, street, city, state, and zip with text data-->
<!ELEMENT name (#PCDATA)>
<!ELEMENT company (#PCDATA)>
<!ELEMENT street (#PCDATA)>
<!ELEMENT city (#PCDATA)>
<!ELEMENT state (#PCDATA)>
<!ELEMENT zip (#PCDATA)>
<!--Setting condition an invoice may contain multiple items-->
<!ELEMENT items (item*)>
<!--Expanding item element with 2 attributes-->
<!ELEMENT item (product, quantity)>
<!--Expanding product element with 2 attributes-->
<!ELEMENT product (description, price)>
<!--Declaring description, price, quantity with text data-->
<!ELEMENT description (#PCDATA)>
<!ELEMENT price (#PCDATA)>
<!ELEMENT quantity (#PCDATA)>
<!--Closing the invoice DTD-->
]>
Explanation:
- To design the DTD for invoice, first identify the elements for invoice...

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Chapter 25 Solutions
Big Java, Binder Ready Version: Early Objects
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