4.13. SUMMARY OF SCHEME SYNTAX

61

 A2

...

 An

If the multiple keyword is present in the attribute list of the select element,

then the user is allowed to select several of the options simultaenously; otherwise,

the user can only select one. The value attributes in the option elements are

sent to the server if the item is selected. If there is no value attribute then the

text between the option tags is sent in its place.

Exercise 15 Rewrite all of the examples given in the earlier sections of this

Chapter using HTML forms to get the information from the user instead of

requiring the user to explicitly encode the information in the URL.

Exercise 16 Write a servlet which first generates a form containing all of the

form tags given above. The servlet should echo back all of the information

collected (and may add some commentary if you want).

4.13

Summary of Scheme Syntax

Figure 4.1 hows all of the Scheme expressions we have seen in this chapter and

Figure 4.2 shows the Scheme procedures we have encountered thus far.