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Expressions
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v0.91
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<h1>Expressions</h1>
<h2><a id="contents" />Contents</h2>
<div>
1 <a href="#introduction">Introduction</a><br />
2 <a href="#expression-syntax">Expression syntax</a><br />
3 <a href="#datatypes">Data types</a><br />
4 <a href="#operators">Operators</a>
<div style="margin-left: 20px;">
4.1 <a href="#operator-precedence">Operator precedence</a><br/>
4.2 <a href="#numeric-operators">Operators on Numeric Values</a>
<div style="margin-left: 20px;">
4.2.1 <a href="#op-num-add">Add</a><br />
4.2.2 <a href="#op-num-subtract">Subtract</a><br />
4.2.3 <a href="#op-num-multiply">Multiply</a><br />
4.2.4 <a href="#op-num-divide">Divide</a><br />
4.2.5 <a href="#op-num-mod">Mod</a><br />
4.2.6 <a href="#op-num-equal">Equal</a><br />
4.2.7 <a href="#op-num-inequal">Inequal</a><br />
4.2.8 <a href="#op-num-greater-than">Greater than</a><br />
4.2.9 <a href="#op-num-greater-than-or-equal">Greater than or equal</a><br />
4.2.10 <a href="#op-num-less-than">Less than</a><br />
4.2.11 <a href="#op-num-less-than-or-equal">Less than or equal</a><br />
4.2.12 <a href="#op-num-unary-plus">Unary plus</a><br />
4.2.13 <a href="#op-num-unary-minus">Unary minus</a>
</div>
</div>
<div style="margin-left: 20px;">
4.3 <a href="#boolean-operators">Operators on Boolean Values</a>
<div style="margin-left: 20px;">
4.3.1 <a href="#op-boolean-equal">Equal</a><br />
4.3.2 <a href="#op-boolean-inequal">Inequal</a><br />
4.3.3 <a href="#op-boolean-greater-than">Greater than</a><br />
4.3.4 <a href="#op-boolean-greater-than-or-equal">Greater than or equal</a><br />
4.3.5 <a href="#op-boolean-less-than">Less than</a><br />
4.3.6 <a href="#op-boolean-less-than-or-equal">Less than or equal</a><br />
4.3.7 <a href="#op-boolean-logical-and">Logical and</a><br />
4.3.8 <a href="#op-boolean-logical-or">Logical or</a><br />
</div>
</div>
<div style="margin-left: 20px;">
4.4 <a href="#string-operators">Operators on String Values</a>
<div style="margin-left: 20px;">
4.4.1 <a href="#op-string-concat">Concat</a><br />
4.4.2 <a href="#op-string-equal">Equal</a><br />
4.4.3 <a href="#op-string-inequal">Inequal</a><br />
4.4.4 <a href="#op-string-greater-than">Greater than</a><br />
4.4.5 <a href="#op-string-greater-than-or-equal">Greater than or equal</a><br />
4.4.6 <a href="#op-string-less-than">Less than</a><br />
4.4.7 <a href="#op-string-less-than-or-equal">Less than or equal</a><br />
</div>
</div>
<div style="margin-left: 20px;">
4.5 <a href="#datetime-operators">Operators on TimeSpan and DateTime Values</a>
<div style="margin-left: 20px;">
4.5.1 <a href="#op-datetime-add">Add</a><br />
4.5.2 <a href="#op-datetime-subtract">Subtract</a><br />
4.5.3 <a href="#op-datetime-equal">Equal</a><br />
4.5.4 <a href="#op-datetime-inequal">Inequal</a><br />
4.5.5 <a href="#op-datetime-greater-than">Greater than</a><br />
4.5.6 <a href="#op-datetime-greater-than-or-equal">Greater than or equal</a><br />
4.5.7 <a href="#op-datetime-less-than">Less than</a><br />
4.5.8 <a href="#op-datetime-less-than-or-equal">Less than or equal</a><br />
</div>
</div>
<div style="margin-left: 20px;">
4.6 <a href="#version-operators">Operators on Version Values</a>
<div style="margin-left: 20px;">
4.6.1 <a href="#op-version-equal">Equal</a><br />
4.6.2 <a href="#op-version-inequal">Inequal</a><br />
4.6.3 <a href="#op-version-greater-than">Greater than</a><br />
4.6.4 <a href="#op-version-greater-than-or-equal">Greater than or equal</a><br />
4.6.5 <a href="#op-version-less-than">Less than</a><br />
4.6.6 <a href="#op-version-less-than-or-equal">Less than or equal</a><br />
</div>
</div>
</div>
<h2><a id="introduction" />1 Introduction</h2>
<p>Expressions are simple, yet powerful mechanism that allows you to write advanced
formulas to be used in task arguments and conditions that direct the build
process. Expressions can access project <a href="properties.html">properties</a>
and call builtin or user-defined <a href="../functions/index.html">functions</a>.</p>
<p>
NAnt provides a rich set of bulitin functions, that allow you to:</p>
<ul>
<li>
manipulate strings</li>
<li>
manipulate date/time values</li>
<li>
manipulate path names</li>
<li>
read the properties of files/directories</li>
<li>
access current build information and more</li>
<li>
and more</li>
</ul>
<p>For a full list of supported functions, click <a href="../functions/index.html">here</a>.</p>
<h2><a id="expression-syntax" />2 Expression Syntax</h2>
<p>Expressions can be used in all task arguments, by using <code>${...}</code> notation.
You may use standard syntax for arithmetical (addition, subtraction,
multiplication, division, modulus), logical (negation, conjunction,
alternative) and relational operators (equality, inequality). To call
functions, use <code>prefix::function-name(argument1, ..., argumentN)</code> syntax.
To access properties, you simply use their names without any prefix or suffix.
See the examples section below for more information.</p>
<p><b>NOTE</b>: Expressions are often used in XML attributes. The grammar specified in this
section applies to the attribute value after XML 1.0 normalization. So, for
example, if the grammar uses the character <code><</code>, this must not
appear in the XML source as <code><</code> but must be quoted according to
XML 1.0 rules by, for example, entering it as <code>&lt;</code>.
</p>
<h3>Examples:</h3>
<ol>
<li>
Accessing a property:
<p>
<code><property name="build.version" value="3" /></code><br />
<code><echo message="The current date is:
<span class="expression">${build.version}</span>" /></code>
</p>
<p>This will output the current value of <code>build.version</code> property.</p>
</li>
<li>
Calling a function
<p>
<code><echo message="The current date is:
<span class="expression">${<a href="../functions/datetime.now.html">datetime::now</a>()}</span>"
/></code>
</p>
<p>This will output the current date and time.</p>
</li>
<li>
Storing the result of an expression
<p>To store the result of an expression in a property, use the <code><property></code>
task:</p>
<p>
<code><property name="autoexec-present" value="<span class="expression">${<a href="../functions/file.exists.html">file::exists</a>('c:\autoexec.bat')}</span>"
/></code>
</p>
<p>This will set the property <code>autoexec-present</code> to either <b>true</b>
or <b>false</b> depending on whether the specified file exists or not.</p>
</li>
<li>
Real-life expression use
<p>
<code><property name="myprj.basedir" value="c:\" /><br />
<property name="filename" value="<span class="expression">${<a href="../functions/path.combine.html">path::combine</a>(myprj.basedir,'version.txt')}</span>"
/><br />
<br />
<if test="<span class="expression">${not <a href="../functions/file.exists.html">file::exists</a>(filename) or <a href="../functions/file.get-length.html">file::get-length</a>(filename) = 0}</span>"><br />
<echo message="The version file
<span class="expression">${filename}</span>
doesn't exist or is empty!" /><br />
</if><br/> </code>
</p>
<p>This will check for the existence of a file <i>version.txt</i>
in a directory specified by myprj.basedir. Note that this makes use of the
short-circuit evaluation supported by NAnt, so you can test for the existence
of the file and check its length in the same expression. ( ie like C, NAnt will
not evaluate the second part of an 'or' expression if the first evaluates to
<b>true</b> )
</p>
</li>
<li>
Using expressions to conditionally execute tasks
<p>All tasks support <code>if</code> and <code>unless</code> attributes.
Expressions can be used there to control which tasks get executed:</p>
<p>
<code><property name="myprj.basedir" value="c:\" unless="<a href="../functions/property.exists.html">property::exists</a>('myprj.basedir')"
/><br />
<csc target="library" output="out.dll" ...
<br />
if="<span class="expression">${<a href="../functions/datetime.now.html">datetime::now</a>() - <a href="../functions/file.get-last-write-time.html">file::get-last-write-time</a>('out.dll')) > <a href="../functions/timespan.from-hours.html">timespan::from-hours</a>(1)}</span>"><br />
...<br />
</csc><br />
</code>
</p>
<p>
This will rebuild the C# library only if it was last rebuilt more than an hour
ago.
</p>
</li>
</ol>
<h2><a id="datatypes" />3 Data types</h2>
<p>Expressions can access, pass and return values of the following types:</p>
<div class="table">
<table>
<tr>
<th>
Type</th>
<th>
Allowed values</th>
</tr>
<tr>
<td>int</td>
<td>32-bit signed integer value</td>
</tr>
<tr>
<td>long</td>
<td>64-bit signed integer value</td>
</tr>
<tr>
<td>double</td>
<td>64-bit signed double precision floating point value</td>
</tr>
<tr>
<td>boolean</td>
<td><b>true</b> or <b>false</b></td>
</tr>
<tr>
<td>string</td>
<td>strings of characters of any length.</td>
</tr>
<tr>
<td>datetime</td>
<td>values represeting date & time (range is from 00:00:00, January 1, 1 AD to
23:59:59, December 31, 9999 AD)</td>
</tr>
<tr>
<td>timespan</td>
<td>represents a time interval.</td>
</tr>
<tr>
<td>version</td>
<td>represents a version number consisting of two to four components.</td>
</tr>
</table>
</div>
<p>In addition, the expression evaluation engine allows you to return and pass
values of any CLI type through the use of <a href="functions.html#custom">custom
functions</a>. Note that there's no support for implicit type conversions.</p>
<h2><a id="operators" />4 Operators</h2>
<h3><a id="operator-precedence" />4.1 Operator precedence</h3>
<p>NAnt expressions support standard ( c style ) operator precedence, that we're
accustomed to:</p>
<ul>
<li>
<code>and</code> is evaluated before <code>or</code>, left to right. For
example <code>false or true and true and false</code> evaluates as <code>false or
((true and true) and false)</code></li>
<li>
multiplication,division and modulus are evaluated before addition and
subtraction, left to right. For example <code>1 + 2 * 3 / 4</code> evaluates as <code>
1 + ((2 * 3) / 4)</code></li>
<li>
parentheses can be used to override the default operator precedence. For
example <code>(1 + 2) * 3</code> evaluates as written, even though the
multiplication has precedence over addition</li>
</ul>
<p><b>NOTE</b>: Because NAnt supports properties whose names can contain dashes,
there's a possible ambiguity between the subtraction of two properties and
accessing a single property with a name containing a dash:</p>
<p>
<code>aaa-bbb</code> - this is ambiguous. It could either be <span style="text-decoration: underline;">property <code>aaa</code>
MINUS property <code>bbb</code></span> or <span style="text-decoration: underline;">property <code>aaa-bbb</code></span>.</p>
<p>To avoid confusion, it's recommended to surround the subtraction operator (or
even better, all binary operators) with spaces. The expression <code>aaa - bbb</code>
always evaluates as a subtraction.</p>
<h3><a id="numeric-operators" />4.2 Operators on Numeric Values</h3>
<p>The following operators are supported on numeric values:</p>
<ul>
<li>
+ operator
</li>
<li>
- operator
</li>
<li>
* operator
</li>
<li>
/ operator
</li>
<li>
% operator
</li>
<li>
== operator
</li>
<li>
!= operator
</li>
<li>
> operator
</li>
<li>
>= operator
</li>
<li>
< operator
</li>
<li>
<= operator
</li>
<li>
unary plus
</li>
<li>
unary minus (negation)
</li>
</ul>
<h4><a id="op-num-add" />4.2.1 Add</h4>
<h5>Summary</h5>
<p>
Returns the arithmetic sum of its operands.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>int</td>
<td>int</td>
<td>
<code>1 + 5</code> evaluates to <code>6</code>
</td>
</tr>
<tr>
<td>int</td>
<td>long</td>
<td>
<code>1 + 6666666667</code> evaluates to <code>6666666668</code>
</td>
</tr>
<tr>
<td>int</td>
<td>double</td>
<td>
<code>1 + 5.0</code> evaluates to <code>6.0</code>
</td>
</tr>
<tr>
<td>long</td>
<td>long</td>
<td>
<code>6666666667 + 11111111111</code> evaluates to <code>17777777778</code>
</td>
</tr>
<tr>
<td>long</td>
<td>int</td>
<td>
<code>6666666667 + 1</code> evaluates to <code>6666666668</code>
</td>
</tr>
<tr>
<td>long</td>
<td>double</td>
<td>
<code>6666666667 + 1.5</code> evaluates to <code>6666666668.5</code>
</td>
</tr>
<tr>
<td>double</td>
<td>double</td>
<td>
<code>1.5 + 5.0</code> evaluates to <code>6.5</code>
</td>
</tr>
<tr>
<td>double</td>
<td>int</td>
<td>
<code>1.0 + 5</code> evaluates to <code>6.0</code>
</td>
</tr>
<tr>
<td>double</td>
<td>long</td>
<td>
<code>1.5 + 6666666667</code> evaluates to <code>6666666668.5</code>
</td>
</tr>
</table>
</div>
<h4><a id="op-num-subtract" />4.2.2 Subtract</h4>
<h5>Summary</h5>
<p>
Returns the arithmetic difference of its operands.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>int</td>
<td>int</td>
<td>
<code>5 - 1</code> evaluates to <code>4</code>
</td>
</tr>
<tr>
<td>int</td>
<td>long</td>
<td>
<code>5 - 6666666667</code> evaluates to <code>-6666666662</code>
</td>
</tr>
<tr>
<td>int</td>
<td>double</td>
<td>
<code>5.0 - 1</code> evaluates to <code>4.0</code>
</td>
</tr>
<tr>
<td>long</td>
<td>long</td>
<td>
<code>11111111111 - 6666666667</code> evaluates to <code>4444444444</code>
</td>
</tr>
<tr>
<td>long</td>
<td>int</td>
<td>
<code>6666666667 - 5</code> evaluates to <code>6666666662</code>
</td>
</tr>
<tr>
<td>long</td>
<td>double</td>
<td>
<code>6666666667 - 1.5</code> evaluates to <code>6666666665.5</code>
</td>
</tr>
<tr>
<td>double</td>
<td>double</td>
<td>
<code>5.0 - 1.0</code> evaluates to <code>4.0</code>
</td>
</tr>
<tr>
<td>double</td>
<td>int</td>
<td>
<code>5.0 - 1</code> evaluates to <code>4.0</code>
</td>
</tr>
<tr>
<td>double</td>
<td>long</td>
<td>
<code>1.5 - 6666666667</code> evaluates to <code>-6666666665.5</code>
</td>
</tr>
</table>
</div>
<h4><a id="op-num-multiply" />4.2.3 Multiply</h4>
<h5>Summary</h5>
<p>
Returns the arithmetic product of its operands.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>int</td>
<td>int</td>
<td>
<code>5 * 2</code> evaluates to <code>10</code>
</td>
</tr>
<tr>
<td>int</td>
<td>long</td>
<td>
<code>2 * 6666666667</code> evaluates to <code>13333333334</code>
</td>
</tr>
<tr>
<td>int</td>
<td>double</td>
<td>
<code>5 * 2.0</code> evaluates to <code>10.0</code>
</td>
</tr>
<tr>
<td>long</td>
<td>long</td>
<td>
<code>6666666667 * long::parse('2')</code> evaluates to <code>13333333334</code>
</td>
</tr>
<tr>
<td>long</td>
<td>int</td>
<td>
<code>6666666667 * 2</code> evaluates to <code>13333333334</code>
</td>
</tr>
<tr>
<td>long</td>
<td>double</td>
<td>
<code>6666666667 * 1.7</code> evaluates to <code>11333333333.9</code>
</td>
</tr>
<tr>
<td>double</td>
<td>double</td>
<td>
<code>5.0 * 2.0</code> evaluates to <code>10.0</code>
</td>
</tr>
<tr>
<td>double</td>
<td>int</td>
<td>
<code>5.0 * 2</code> evaluates to <code>10.0</code>
</td>
</tr>
<tr>
<td>double</td>
<td>long</td>
<td>
<code>1.7 * 6666666667</code> evaluates to <code>11333333333.9</code>
</td>
</tr>
</table>
</div>
<h4><a id="op-num-divide" />4.2.4 Divide</h4>
<h5>Summary</h5>
<p>
Returns the arithmetic quotient of its operands.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>int</td>
<td>int</td>
<td>
<code>10 / 2</code> evaluates to <code>5</code>
</td>
</tr>
<tr>
<td>int</td>
<td>long</td>
<td>
<code>10 / 10000000000</code> evaluates to <code>0.000000001</code>
</td>
</tr>
<tr>
<td>int</td>
<td>double</td>
<td>
<code>8 / 2.0</code> evaluates to <code>4.0</code>
</td>
</tr>
<tr>
<td>long</td>
<td>long</td>
<td>
<code>13333333334 / 6666666667</code> evaluates to <code>2</code>
</td>
</tr>
<tr>
<td>long</td>
<td>int</td>
<td>
<code>13333333334 / 2</code> evaluates to <code>6666666667</code>
</td>
</tr>
<tr>
<td>long</td>
<td>double</td>
<td>
<code>13333333334 / 2.0</code> evaluates to <code>6666666667.0</code>
</td>
</tr>
<tr>
<td>double</td>
<td>double</td>
<td>
<code>9.0 / 2.0</code> evaluates to <code>4.5</code>
</td>
</tr>
<tr>
<td>double</td>
<td>int</td>
<td>
<code>6.0 / 3</code> evaluates to <code>2.0</code>
</td>
</tr>
<tr>
<td>double</td>
<td>long</td>
<td>
<code>20000000000.0 / 10000000000</code> evaluates to <code>2.0</code>
</td>
</tr>
</table>
</div>
<h5>Remarks</h5>
<p>
If the divisor is zero, then an error is raised.
</p>
<h4><a id="op-num-mod" />4.2.5 Mod</h4>
<h5>Summary</h5>
<p>
Returns the remainder after dividing its first operand by its second.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>int</td>
<td>int</td>
<td>
<code>5 % 3</code> evaluates to <code>2</code>
</td>
</tr>
<tr>
<td>int</td>
<td>long</td>
<td>
<code>10 % 6666666667</code> evaluates to <code>10</code>
</td>
</tr>
<tr>
<td>int</td>
<td>double</td>
<td>
<code>5 % 3.5</code> evaluates to <code>1.5</code>
</td>
</tr>
<tr>
<td>long</td>
<td>long</td>
<td>
<code>13333333334 % 6666666667</code> evaluates to <code>0</code>
</td>
</tr>
<tr>
<td>long</td>
<td>int</td>
<td>
<code>6666666667 % 10</code> evaluates to <code>7</code>
</td>
</tr>
<tr>
<td>long</td>
<td>double</td>
<td>
<code>6666666667 % 3.5</code> evaluates to <code>3.0</code>
</td>
</tr>
<tr>
<td>double</td>
<td>double</td>
<td>
<code>9.0 % 4.7</code> evaluates to <code>4.3</code>
</td>
</tr>
<tr>
<td>double</td>
<td>int</td>
<td>
<code>8.5 % 2</code> evaluates to <code>0.5</code>
</td>
</tr>
<tr>
<td>double</td>
<td>long</td>
<td>
<code>20000000000.0 % 6666666667</code> evaluates to <code>6666666666.0</code>
</td>
</tr>
</table>
</div>
<h5>Remarks</h5>
<p>
If the divisor is zero, then an error is raised.
</p>
<h4><a id="op-num-equal" />4.2.6 Equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if and only if the value of the first operand is equal to the
value of the second operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>int</td>
<td>int</td>
<td>
<code>5 == 3</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>int</td>
<td>long</td>
<td>
<code>5 == 6666666667</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>int</td>
<td>double</td>
<td>
<code>6 == 6.0</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>long</td>
<td>long</td>
<td>
<code>6666666667 == 6666666667</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>long</td>
<td>int</td>
<td>
<code>6666666667 == 665</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>long</td>
<td>double</td>
<td>
<code>6666666667 == 6666666667.0</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>double</td>
<td>double</td>
<td>
<code>9.5 == 6.7</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>double</td>
<td>int</td>
<td>
<code>8.5 == 8</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>double</td>
<td>long</td>
<td>
<code>8.5 == 6666666667</code> evaluates to <b>false</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-num-inequal" />4.2.7 Inequal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if and only if the value of the first operand is not equal to the
value of the second operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>int</td>
<td>int</td>
<td>
<code>5 != 3</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>int</td>
<td>long</td>
<td>
<code>5 != 6666666667</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>int</td>
<td>double</td>
<td>
<code>6 != 6.0</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>long</td>
<td>long</td>
<td>
<code>6666666667 != 6666666667</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>long</td>
<td>int</td>
<td>
<code>6666666667 != 665</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>long</td>
<td>double</td>
<td>
<code>6666666667 != 6666666667.0</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>double</td>
<td>double</td>
<td>
<code>9.5 != 6.7</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>double</td>
<td>int</td>
<td>
<code>8.5 != 8</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>double</td>
<td>long</td>
<td>
<code>8.5 != 6666666667</code> evaluates to <b>true</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-num-greater-than" />4.2.8 Greater than</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if and only if the first operand is greater than the
second operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>int</td>
<td>int</td>
<td>
<code>5 > 3</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>int</td>
<td>long</td>
<td>
<code>5 > 6666666667</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>int</td>
<td>double</td>
<td>
<code>6 > 4.0</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>long</td>
<td>long</td>
<td>
<code>6666666667 > 6666666667</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>long</td>
<td>int</td>
<td>
<code>6666666667 > 665</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>long</td>
<td>double</td>
<td>
<code>6666666667 > 6666666667.0</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>double</td>
<td>double</td>
<td>
<code>9.5 > 9.5</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>double</td>
<td>int</td>
<td>
<code>8.3 > 9</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>double</td>
<td>long</td>
<td>
<code>8.5 > 6666666667</code> evaluates to <b>false</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-num-greater-than-or-equal" />4.2.9 Greater than or equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if and only if the first operand is greater than or
equal to second operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>int</td>
<td>int</td>
<td>
<code>5 >= 3</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>int</td>
<td>long</td>
<td>
<code>5 >= 6666666667</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>int</td>
<td>double</td>
<td>
<code>6 >= 4.0</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>long</td>
<td>long</td>
<td>
<code>6666666667 >= 6666666667</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>long</td>
<td>int</td>
<td>
<code>6666666667 >= 665</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>long</td>
<td>double</td>
<td>
<code>6666666667 >= 6666666667.0</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>double</td>
<td>double</td>
<td>
<code>9.5 >= 9.5</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>double</td>
<td>int</td>
<td>
<code>8.3 >= 9</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>double</td>
<td>long</td>
<td>
<code>8.5 >= 6666666667</code> evaluates to <b>false</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-num-less-than" />4.2.10 Less than</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if and only if the first operand is less than the
second operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>int</td>
<td>int</td>
<td>
<code>5 < 3</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>int</td>
<td>long</td>
<td>
<code>5 < 6666666667</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>int</td>
<td>double</td>
<td>
<code>6 < 7.0</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>long</td>
<td>long</td>
<td>
<code>6666666667 < 6666666667</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>long</td>
<td>int</td>
<td>
<code>6666666667 < 665</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>long</td>
<td>double</td>
<td>
<code>6666666667 < 6666666667.0</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>double</td>
<td>double</td>
<td>
<code>9.5 < 9.5</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>double</td>
<td>int</td>
<td>
<code>8.3 < 9</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>double</td>
<td>long</td>
<td>
<code>8.5 < 6666666667</code> evaluates to <b>true</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-num-less-than-or-equal" />4.2.11 Less than or equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if and only if the first operand is less than or
equal to second operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>int</td>
<td>int</td>
<td>
<code>5 <= 3</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>int</td>
<td>long</td>
<td>
<code>5 <= 6666666667</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>int</td>
<td>double</td>
<td>
<code>6 <= 7.0</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>long</td>
<td>long</td>
<td>
<code>6666666667 <= 6666666667</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>long</td>
<td>int</td>
<td>
<code>6666666667 <= 665</code> evaluates to <b>false</b>
</td>
</tr>
<tr>
<td>long</td>
<td>double</td>
<td>
<code>6666666667 <= 6666666667.0</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>double</td>
<td>double</td>
<td>
<code>9.5 <= 9.5</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>double</td>
<td>int</td>
<td>
<code>8.3 <= 9</code> evaluates to <b>true</b>
</td>
</tr>
<tr>
<td>double</td>
<td>long</td>
<td>
<code>8.5 <= 6666666667</code> evaluates to <b>true</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-num-unary-plus" />4.2.12 Unary plus</h4>
<h5>Summary</h5>
<p>
Returns its operand with the sign unchanged. Semantically, this operation
performs no operation.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>int</td>
<td>
<code>(+1)</code> evaluates to <code>1</code>
</td>
</tr>
<tr>
<td>long</td>
<td>
<code>(+6666666667)</code> evaluates to <code>6666666667</code>
</td>
</tr>
<tr>
<td>double</td>
<td>
<code>(+1.5)</code> evaluates to <code>1.5</code>
</td>
</tr>
</table>
</div>
<h4><a id="op-num-unary-minus" />4.2.13 Unary minus</h4>
<h5>Summary</h5>
<p>
Returns its operand with the sign reversed.
</p>
<p>
If the operand is positive, its negative is returned; if it is negative, its
positive is returned.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>int</td>
<td>
<code>(-1)</code> evaluates to <code>-1</code>
</td>
</tr>
<tr>
<td>long</td>
<td>
<code>(-6666666667)</code> evaluates to <code>-6666666667</code>
</td>
</tr>
<tr>
<td>double</td>
<td>
<code>(-9.6)</code> evaluates to <code>-9.6</code>
</td>
</tr>
</table>
</div>
<h3><a id="boolean-operators" />4.3 Operators on Boolean Values</h3>
<p>The following operators are supported on boolean values:</p>
<ul>
<li>
== operator
</li>
<li>
!= operator
</li>
<li>
> operator
</li>
<li>
>= operator
</li>
<li>
< operator
</li>
<li>
<= operator
</li>
<li>
and operator
</li>
<li>
or operator
</li>
</ul>
<h4><a id="op-boolean-equal" />4.3.1 Equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if both operands are <b>true</b> or if both
operands are <b>false</b>.
</p>
<h5>Examples</h5>
<h4><a id="op-boolean-inequal" />4.3.2 Inequal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the first operand is <b>true</b> and the
second operand is <b>false</b>, or the first operand is <b>false</b>
and the second operand is <b>true</b>.
</p>
<h5>Examples</h5>
<h4><a id="op-boolean-greater-than" />4.3.3 Greater than</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the first operand is <b>true</b> and the
second operand is <b>false</b>; otherwise, returns <b>false</b>.
</p>
<h5>Examples</h5>
<h4><a id="op-boolean-greater-than-or-equal" />4.3.4 Greater than or equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the first operand is <b>true</b> and the
second operand is <b>false</b>, or both operands are either <b>true</b>
or <b>false</b>.
</p>
<h5>Examples</h5>
<h4><a id="op-boolean-less-than" />4.3.5 Less than</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the first operand is <b>false</b> and the
second operand is <b>true</b>; otherwise, returns <b>false</b>.
</p>
<h5>Examples</h5>
<h4><a id="op-boolean-less-than-or-equal" />4.3.6 Less than or equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the first operand is <b>false</b> and the
second operand is <b>true</b>, or both operands are either <b>true</b>
or <b>false</b>.
</p>
<h5>Examples</h5>
<h4><a id="op-boolean-logical-and" />4.3.7 Logical and</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if both operands are <b>true</b>,
otherwise returns <b>false</b>.
</p>
<h5>Examples</h5>
<p>
<code><if test="${A and B}"></code>
</p>
<h4><a id="op-boolean-logical-or" />4.3.8 Logical or</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if either operand is <b>true</b>,
otherwise returns <b>false</b>.
</p>
<h5>Examples</h5>
<p>
<code><if test="${A or B}"></code>
</p>
<h3><a id="string-operators" />4.4 Operators on String Values</h3>
<p>The following operators are supported on string values:</p>
<ul>
<li>
+ operator
</li>
<li>
== operator
</li>
<li>
!= operator
</li>
<li>
> operator
</li>
<li>
>= operator
</li>
<li>
< operator
</li>
<li>
<= operator
</li>
</ul>
<h4><a id="op-string-concat" />4.4.1 Concat</h4>
<h5>Summary</h5>
<p>
Returns the concatenation of both string operands.
</p>
<h5>Examples</h5>
<h4><a id="op-string-equal" />4.4.2 Equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the left operand is the same as the
value of the right operand.
</p>
<h5>Remarks</h5>
<p>
The comparison is case-sensitive and culture-insensitive.
</p>
<h4><a id="op-string-inequal" />4.4.3 Inequal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the first operand is not the same as
the value of the second operand.
</p>
<h5>Remarks</h5>
<p>
The comparison is case-sensitive and culture-insensitive.
</p>
<h4><a id="op-string-greater-than" />4.4.4 Greater than</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the first operand is greater than the seconds
operand.
</p>
<h5>Remarks</h5>
<p>
The comparison is case-sensitive and culture-insensitive.
</p>
<h4><a id="op-string-greater-than-or-equal" />4.4.5 Greater than or equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the first operand is greater than or equal to the
seconds operand.
</p>
<h5>Remarks</h5>
<p>
The comparison is case-sensitive and culture-insensitive.
</p>
<h4><a id="op-string-less-than" />4.4.6 Less than</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the first operand is less than the seconds
operand.
</p>
<h5>Remarks</h5>
<p>
The comparison is case-sensitive and culture-insensitive.
</p>
<h4><a id="op-string-less-than-or-equal" />4.4.7 Less than or equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the first operand is less than or equal to the
seconds operand.
</p>
<h5>Remarks</h5>
<p>
The comparison is case-sensitive and culture-insensitive.
</p>
<h3><a id="datetime-operators" />4.5 Operators on TimeSpan and DateTime Values</h3>
<p>The following operators are supported on timespan and datetime values:</p>
<ul>
<li>
+ operator
</li>
<li>
- operator
</li>
<li>
== operator
</li>
<li>
!= operator
</li>
<li>
> operator
</li>
<li>
>= operator
</li>
<li>
< operator
</li>
<li>
<= operator
</li>
</ul>
<h4><a id="op-datetime-add" />4.5.1 Add</h4>
<h5>Summary</h5>
<p>
Returns the result of adding the value of the left operand to the value of the
right operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>datetime</td>
<td>timespan</td>
<td>
<code>datetime::now() + timespan::from-days(10)</code>
evaluates to a datetime 10 days in the future
</td>
</tr>
<tr>
<td>timespan</td>
<td>timespan</td>
<td>
<code>timespan::from-seconds(30) + timespan::from-minutes(10)</code>
evaluates to a timespan representing a duratio of 10 minutes and 30
seconds
</td>
</tr>
</table>
</div>
<h4><a id="op-datetime-subtract" />4.5.2 Subtract</h4>
<h5>Summary</h5>
<p>
Returns the result of subtracting the value of the right operand
from the value of the left operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>datetime</td>
<td>datetime</td>
<td>
<code>(datetime::now() + timespan::from-days(10)) - datetime::now</code>
evaluates to a timespan representing a duration of 10 days
</td>
</tr>
<tr>
<td>datetime</td>
<td>timespan</td>
<td>
<code>datetime::now() - timespan::from-days(3)</code> evaluates
to a datetime 3 days in the past
</td>
</tr>
<tr>
<td>timespan</td>
<td>timespan</td>
<td>
<code>timespan::from-minutes(15) - timespan::from-minutes(10)</code> evaluates
to a timespan representing 5 minutes
</td>
</tr>
</table>
</div>
<h4><a id="op-datetime-equal" />4.5.3 Equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the left operand is the same as the
value of the right operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>datetime</td>
<td>datetime</td>
<td>
<code>datetime::now() == (datetime::now() + timespan::from-days(10))</code> evaluates
to <b>false</b>
</td>
</tr>
<tr>
<td>timespan</td>
<td>timespan</td>
<td>
<code>timespan::from-seconds(30) == timespan::from-seconds(30)</code> evaluates
to <b>true</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-datetime-inequal" />4.5.4 Inequal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the left operand is not the same as
the value of the right operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>datetime</td>
<td>datetime</td>
<td>
<code>datetime::now() != (datetime::now() + timespan::from-days(10))</code> evaluates
to <b>true</b>
</td>
</tr>
<tr>
<td>timespan</td>
<td>timespan</td>
<td>
<code>timespan::from-seconds(30) != timespan::from-seconds(30)</code> evaluates
to <b>false</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-datetime-greater-than" />4.5.5 Greater than</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the left operand is greater than the
value of the right operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>datetime</td>
<td>datetime</td>
<td>
<code>datetime::now() > (datetime::now() + timespan::from-days(10))</code> evaluates
to <b>false</b>
</td>
</tr>
<tr>
<td>timespan</td>
<td>timespan</td>
<td>
<code>timespan::from-seconds(30) > timespan::from-seconds(30)</code> evaluates
to <b>false</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-datetime-greater-than-or-equal" />4.5.6 Greater than or equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the left operand is greater than or
equal to the value of the right operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>datetime</td>
<td>datetime</td>
<td>
<code>datetime::now() >= (datetime::now() + timespan::from-days(10))</code> evaluates
to <b>false</b>
</td>
</tr>
<tr>
<td>timespan</td>
<td>timespan</td>
<td>
<code>timespan::from-seconds(30) >= timespan::from-seconds(30)</code> evaluates
to <b>true</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-datetime-less-than" />4.5.7 Less than</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the left operand is less than the
value of the right operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>datetime</td>
<td>datetime</td>
<td>
<code>datetime::now() < (datetime::now() + timespan::from-days(10))</code> evaluates
to <b>true</b>
</td>
</tr>
<tr>
<td>timespan</td>
<td>timespan</td>
<td>
<code>timespan::from-seconds(30) < timespan::from-seconds(30)</code> evaluates
to <b>false</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-datetime-less-than-or-equal" />4.5.8 Less than or equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the left operand is less than the
value of the right operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>datetime</td>
<td>datetime</td>
<td>
<code>datetime::now() <= (datetime::now() + timespan::from-days(10))</code> evaluates
to <b>true</b>
</td>
</tr>
<tr>
<td>timespan</td>
<td>timespan</td>
<td>
<code>timespan::from-seconds(30) <= timespan::from-seconds(30)</code> evaluates
to <b>true</b>
</td>
</tr>
</table>
</div>
<h3><a id="version-operators" />4.6 Operators on Version Values</h3>
<p>The following operators are supported on version values:</p>
<ul>
<li>
== operator
</li>
<li>
!= operator
</li>
<li>
> operator
</li>
<li>
>= operator
</li>
<li>
< operator
</li>
<li>
<= operator
</li>
</ul>
<h4><a id="op-version-equal" />4.6.1 Equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the left operand is the same as the
value of the right operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>version</td>
<td>version</td>
<td>
<code>version::parse('1.2') == version::parse('1.2')</code> evaluates
to <b>true</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-version-inequal" />4.6.2 Inequal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the left operand is not the same as
the value of the right operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>version</td>
<td>version</td>
<td>
<code>version::parse('1.2') != version::parse('1.3.1')</code> evaluates
to <b>true</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-version-greather-than" />4.6.3 Greater than</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the left operand is greater than the
value of the right operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>version</td>
<td>version</td>
<td>
<code>version::parse('1.2') > version::parse('1.3.1')</code> evaluates
to <b>false</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-version-greater-than-or-equal" />4.6.4 Greater than or equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the left operand is greater than or
equal to the value of the right operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>version</td>
<td>version</td>
<td>
<code>version::parse('1.2') >= version::parse('1.2')</code> evaluates
to <b>true</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-version-less-than" />4.6.5 Less than</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the left operand is less than the
value of the right operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>version</td>
<td>version</td>
<td>
<code>version::parse('1.2') < version::parse('1.3.1')</code> evaluates
to <b>true</b>
</td>
</tr>
</table>
</div>
<h4><a id="op-version-less-than-or-equal" />4.6.6 Less than or equal</h4>
<h5>Summary</h5>
<p>
Returns <b>true</b> if the value of the left operand is less than or
equal to the value of the right operand.
</p>
<h5>Operands</h5>
<div class="table">
<table>
<colgroup>
<col />
<col />
<col />
</colgroup>
<tr>
<th>
Left Operand</th>
<th>
Right Operand</th>
<th>
Example</th>
</tr>
<tr>
<td>version</td>
<td>version</td>
<td>
<code>version::parse('1.2') <= version::parse('1.2')</code> evaluates
to <b>true</b>
</td>
</tr>
</table>
</div>
</body>
</html>