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<xsl:if test="xpath-expression">

An <xsl:if> programming instruction is a conditional construct that causes instructions to be processed if the XPath expression held in the test attribute evaluates to true.



<xsl:if test="xpath-expression">
</xsl:if>

Table 9: Programming Instructions: Examples and Pseudocode

Programming Instruction Examples	Pseudocode Meanings
`<xsl:choose> <xsl:when test="system/host-name"> <change> <system> <host-name>M320</host-name> </system> </change> </xsl:when> <xsl:otherwise> <xnm:error> <message>Missing [edit system host-name] M320.</message> </xnm:error> </xsl:otherwise> </xsl:choose>`	When the host-name statement is included at the [edit system] hierarchy level, change the hostname to M320. Otherwise, issue the warning message: Missing [edit system host-name] M320.
`<xsl:for-each select="interfaces/interface[starts-with(name, 'ge-')]/unit">`	For each Gigabit Ethernet interface configured at the [edit interfaces ge-fpc/pic/port unit logical-unit-number] hierarchy level.
`<xsl:for-each select="data[not(value)]/name">`	Select any macro parameter that does not contain a parameter value. In other words, match all apply-macro statements of the following form: `apply-macro apply-macro-name { parameter-name; }` And ignore all apply-macro statements of the form: `apply-macro apply-macro-name { parameter-name parameter-value; }`
`<xsl:if test="not(system/host-name)">`	If the host-name statement is not included at the [edit system] hierarchy level.
`<xsl:if test="apply-macro[name = 'no-igp']`	If the apply-macro statement named no-igp is included at the current hierarchy level.
`<xsl:if test="not(../apply-macro[name = 'no-ldp'])`	If the apply-macro statement with the name no-ldp is not included two hierarchy levels above the current hierarchy level.

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