web/xml/packaging packaging.en.xml,1.26,1.27

[Daniel M. <dm...@us...>]

Update of /cvsroot/fink/web/xml/packaging
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv14580

Modified Files:
	packaging.en.xml 
Log Message:
Explained order-of-operations in Depends. Documented the single-string
form of conditional syntax.


Index: packaging.en.xml
===================================================================
RCS file: /cvsroot/fink/web/xml/packaging/packaging.en.xml,v
retrieving revision 1.26
retrieving revision 1.27
diff -u -d -r1.26 -r1.27
--- packaging.en.xml	27 Apr 2004 22:43:45 -0000	1.26
+++ packaging.en.xml	30 Apr 2004 08:23:47 -0000	1.27
@@ -1411,16 +1411,25 @@
 If you want to offer the user both options, make two separate
 packages, e.g. wget and wget-ssl.
 </p><p>
+Order of operations: logical &quot;OR&quot; (list of alternatives) has
+a higher precedence (binds more tightly) than the logical
+&quot;AND&quot; between each package (or set of alternatives) in the
+comma-separated list. Unlike the use of parentheses in arithmetic,
+there is no way to specify alternative groups of packages or otherwise
+change the order of operations in <code>Depends</code> and related
+fields.
+</p><p>
 Starting with a post-0.18.2 CVS version of fink, you can have
 conditional dependencies. These are specified by placing
 <code>(string1 op string2)</code> before a package name. Percent
-expansion is performed as usual and then the two strings are compared
+expansion is performed as usual and then the two strings
+(neither of which can be null) are compared
 according to the <code>op</code> operator: &lt;&lt;, &lt;=, =, !=,
 &gt;&gt;, &gt;=. The immediately-following package is only considered
 as a dependency if the comparison is true.
 </p><p>
 You can use this format to simplify maintaining several similar
-packages. For example, both elinks and elinks-ssl could list:
+packages. For example, the packages elinks and elinks-ssl could both list:
 </p>
 <codeblock>Depends: (%n = elinks-ssl) openssl097-shlibs, expat-shlibs</codeblock>
 <p>
@@ -1431,6 +1440,19 @@
 and elinks-ssl list:
 </p>
 <codeblock>Depends: openssl097-shlibs, expat-shlibs</codeblock>
+<p>
+As an alternative syntax, you can also specify <code>(string)</code>,
+which is &quot;true&quot; if <code>string</code> is non-null. For example:
+</p>
+<codeblock>
+Package: nethack%type_pkg[-x11]
+Type: -x11 (boolean)
+Depends: (%type_pkg[-x11]) x11
+</codeblock>
+<p>
+would set the package x11 as a dependency for the nethack-x11 variant
+but not for the nethack variant.
+</p>
 </itemd></item>
 
 <item><itemt>BuildDepends</itemt>