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{% endif %} <p> ( <a href="../dhcp_pool/add/">add new pool</a> ) </p> Again, another pretty standard view template; there are, however, a few things worth mentioning. The first is that the template parser is quite smart and allows you to reference related objects from the ones that are passed as arguments to the template. As you can see, we do not pass a physical network object directly, only the DHCP network; but because the DHCP network has a foreign key that references its parent object, we can simply say dhcp_net.physical_net.address and the Django template engine will find the right piece of information to display. Another thing you might have noticed is the link to the delete function. The object part of the URL became rather lengthy and is defined as <network_address>/<network_size>/dhcp_pool/<range_start>/<range_finish> Strictly from a data modeling perspective, this key has redundant information in it, because a DHCP pool with given range addresses can belong to only one physical network; therefore there is no need to specify the network address in the URL. However, because we are using relative URLs all over the templates, it is a lot easier to just include it here as well. This is a good example of how strict rules sometimes need compromising to achieve greater effectiveness and simplicity in other areas of the code.

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When dealing with documents, it is often useful to be able to uniquely identify elements and be able to easily locate them. Attribute IDs serve this same purpose. When applied to an element, which can have at most a single ID (though this is not the case when using xml:id), the value of the attribute on the element serves as the unique identifier for the element. An IDREF, on the other hand, allows elements to reference these unique elements. At first glance, you may be wondering what purpose the ID and IDREF instances actually serve. Of course, they uniquely identify an element, but what advantage does that offer to you Before answering that question, I ll cover how you construct them. You can create an attribute ID in two ways. The first is through an attribute declaration (ATTLIST) in a DTD. ( 3 covers DTDs in depth; in this chapter, I ll explain ATTLIST and its makeup in regard to IDs.) On February 8, 2004, the W3C released the xml:id specification as a candidate recommendation. This provides a mechanism to define IDs without requiring a DTD. Since this is relatively new, I will begin with the ATTLIST method and then return to xml:id.

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Earlier, when discussing the prolog of the document, I touched upon the document type declaration and where it is defined. Similar to Listing 2-4, you can use an internal subset to declare the attribute. Defining attributes takes the following form: <!ATTLIST element_name attribute_name attribute_type attribute_default > In this case, attribute_type is the ID. Attribute types, as well as the entire ATTLIST definition, are fully explained in 3, so for now, just take this at face value. You also, for now, will use #REQUIRED for attribute_default. This just means every element with the name element_name is required to have the ID attribute named attribute_name defined. Consider the XML document in Listing 2-16, which could serve as a course list for a school.