In order to access a contact resource value in a resource database, an
application uses two items as a ``key'': a <#3439#><B>complete resource name</B><#3439#>,
<A ID="3440"><tex2html_anchor_invisible_mark></A>
<A ID="3441"><tex2html_anchor_invisible_mark></A>
<A ID="3442"><tex2html_anchor_invisible_mark></A>
and a <#3443#><B>complete resource class</B><#3443#><A ID="3444"><tex2html_anchor_invisible_mark></A>. A
contact's complete resource
name and class are derived from the contact and its (current) ancestors. The
complete resource name is a list of symbols of the form <#4728#><TT>(<#4524#><EM>name<SUB>1</SUB>
...name<SUB>n-1</SUB> name<SUB>n</SUB></EM><#4524#>)</TT><#4728#>, where <#4525#><EM>name<SUB>n</SUB></EM><#4525#> is the
<#3449#><TT>name</TT><#3449#> of the contact, <#4526#><EM>name<SUB>n-1</SUB></EM><#4526#> is the <#3451#><TT>name</TT><#3451#> of
the contact's <#3452#><TT>parent</TT><#3452#>, etc., and <#4527#><EM>name<SUB>1</SUB></EM><#4527#> is the <#3454#><TT>name</TT><#3454#> of the <#3455#><TT>contact-display</TT><#3455#> to which the contact belongs (see below).
Similarly, a contact's complete resource class is a list of type symbols of the form
<#4729#><TT>(<#4528#><EM>class<SUB>1</SUB>
...class<SUB>n-1</SUB> class<SUB>n</SUB></EM><#4528#>)</TT><#4729#>, where <#4529#><EM>class<SUB>n</SUB></EM><#4529#> is the
class of the contact,<A NAME="tex2html399" HREF="footnode_mn.html#foot4530" TARGET="footer"><SUP>66.1</SUP></A>
<#4531#><EM>class<SUB>n-1</SUB></EM><#4531#> is the class of
the contact's <#3462#><TT>parent</TT><#3462#>, etc., and <#4532#><EM>class<SUB>1</SUB></EM><#4532#> is the <#3464#><TT>class</TT><#3464#> of
the <#3465#><TT>contact-display</TT><#3465#> to which the contact belongs <A NAME="tex2html400" HREF="footnode_mn.html#footfnm2" TARGET="footer"><SUP>66.2</SUP></A>. Complete resource name and class lists thus have the same length.
<P>
The names of the resources used by a contact are defined by the contact class
and are given by the resource specification list <A ID="3467"><tex2html_anchor_invisible_mark></A>
in a <#3468#><TT>defcontact</TT><#3468#> form (see Section~<A HREF=<tex2html_cr_mark>#ch:defcontact#3469><tex2html_cr_mark></A>). Each such contact
resource also has a complete resource name, defined to be <#4533#><TT>(append
(contact-complete-name <#3470#><EM>contact</EM><#3470#>) (list <#3471#><EM>resource-name</EM><#3471#>))</TT><#4533#>. Similarly, the complete resource
class of a contact resource is defined to be <#4534#><TT>(append
(list <#3473#><EM>resource-class</EM><#3473#>))</TT><#4534#>, where <#3474#><EM>resource-class</EM><#3474#> is given by the
<#3475#><TT>:class</TT><#3475#> option of the resource specification.
<P>
For all contacts that belong
to a <#3476#><TT>contact-display</TT><#3476#>, the ``top-level'' complete resource name component
is a resource name symbol associated with the <#3477#><TT>contact-display</TT><#3477#>. Since an application usually uses a single <#3478#><TT>contact-display</TT><#3478#>, this name is usually a symbol which identifies the
application itself. This name is given as the value of the <#3479#><TT>:name</TT><#3479#> keyword argument to the <#3480#><TT>open-contact-display</TT><#3480#> function.
<A ID="3481"><tex2html_anchor_invisible_mark></A>
In addition,
the <#3482#><TT>display-name</TT><#3482#> and <#3483#><TT>display-class</TT><#3483#>
macros may be used to inquire the name and class, respectively, of a
