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<a name="Functions"></a>
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Previous: <a href="Components.html#Components" accesskey="p" rel="previous">Components</a>, Up: <a href="The-object-model-of-ASDF.html#The-object-model-of-ASDF" accesskey="u" rel="up">The object model of ASDF</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Functions-1"></a>
<h3 class="section">6.3 Functions</h3>
<a name="index-version_002dsatisfies-1"></a>

<dl>
<dt><a name="index-version"></a>version-satisfies: <strong><var>version</var></strong> <em><var>version-spec</var></em></dt>
<dd><p>Does <var>version</var> satisfy the <var>version-spec</var>.  A generic function.
ASDF provides built-in methods for <var>version</var> being a <code>component</code> or <code>string</code>.
<var>version-spec</var> should be a string.
If it&rsquo;s a component, its version is extracted as a string before further processing.
</p>
<p>A version string satisfies the version-spec if after parsing,
the former is no older than the latter.
Therefore <code>&quot;1.9.1&quot;</code>, <code>&quot;1.9.2&quot;</code> and <code>&quot;1.10&quot;</code> all satisfy <code>&quot;1.9.1&quot;</code>,
but <code>&quot;1.8.4&quot;</code> or <code>&quot;1.9&quot;</code> do not.
For more information about how <code>version-satisfies</code> parses and interprets
version strings and specifications,
see <a href="The-defsystem-grammar.html#The-defsystem-grammar">The defsystem grammar</a> (version specifiers) and
<a href="Common-attributes-of-components.html#Common-attributes-of-components">Common attributes of components</a>.
</p>
<p>Note that in versions of ASDF prior to 3.0.1,
including the entire ASDF 1 and ASDF 2 series,
<code>version-satisfies</code> would also require that the version and the version-spec
have the same major version number (the first integer in the list);
if the major version differed, the version would be considered as not matching the spec.
But that feature was not documented, therefore presumably not relied upon,
whereas it was a nuisance to several users.
Starting with ASDF 3.0.1,
<code>version-satisfies</code> does not treat the major version number specially,
and returns T simply if the first argument designates a version that isn&rsquo;t older
than the one specified as a second argument.
If needs be, the <code>(:version ...)</code> syntax for specifying dependencies
could be in the future extended to specify an exclusive upper bound for compatible versions
as well as an inclusive lower bound.
</p></dd></dl>




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