Use the keyref statement of XML Schema to de?ne the following referential integrity for the document in Figure 15.4:
a. Every course code in a CourseTaken element must refer to a valid course.
b. Every course code in a Class element must refer to a valid course.
a.
where adm is the namespace pre?x used for the schema of the document in Figure 15.4 and CourseKey is de?ned as the primary key for Course elements:
b.
refer="adm:CourseKey">
where CourseKey was de?ned above.
You might also like to view...
You can display ____________________ to reveal hidden symbols that indicate paragraph breaks, spaces, and tab stops.
Fill in the blank(s) with the appropriate word(s).
Packet fragmentation is not normal, and can only occur if an attack has been initiated.
Answer the following statement true (T) or false (F)
?The main advantage of a subject directory is that it _____.
A. ?provides an overview when users are not sure of the size and scope of their topic B. ?collects and organizes websites in a bottom-up format, based on subjects and topics C. ?uses specific words and phrases to locate directly the material sought D. ?does not require human expertise to formulate its subject organization
Many users on a small network are reporting that while they can share files amongst each other, access to the Internet has been lost. Lisa, the technician, finds that the Internet addresses are failing to resolve to IP addresses. Which of the following is malfunctioning?
A. DHCP B. DNS C. RADIUS D. VPN