Mixed Content
It is actually possible to specify that an element can contain both PCDATA and other elements. Such a content model is called mixed. To specify a mixed-content model, just list #PCDATA along with the child elements you want to allow:
Listing . ch03_05.xml
<?xml version = "1.0" standalone="yes"?>
<!DOCTYPE DOCUMENT [
<!ELEMENT DOCUMENT (CUSTOMER)*>
<!ELEMENT CUSTOMER (NAME,DATE,ORDERS)>
<!ELEMENT NAME (LAST_NAME,FIRST_NAME)>
<!ELEMENT LAST_NAME (#PCDATA)>
<!ELEMENT FIRST_NAME (#PCDATA)>
<!ELEMENT DATE (#PCDATA)>
<!ELEMENT ORDERS (ITEM)*>
<!ELEMENT ITEM (PRODUCT, NUMBER, PRICE)>
<!ELEMENT PRODUCT (#PCDATA | PRODUCT_ID)*> <!ELEMENT NUMBER (#PCDATA)> <!ELEMENT PRICE (#PCDATA)> <!ELEMENT PRODUCT_ID (#PCDATA)> ]> <DOCUMENT> <CUSTOMER> ... |
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