单选题Which XSL if statement checks for the existence of a homepage attribute within an STS Universal User XML structure?()A xsl:if test=//stsuuser:AttributeList/stsuuser:Attribute[attr='homepage']B xsl:if test=//stsuuser:AttributeList/stsuuser:Attribute[@na

题目
单选题
Which XSL if statement checks for the existence of a homepage attribute within an STS Universal User XML structure?()
A

<xsl:if test=//stsuuser:AttributeList/stsuuser:Attribute[attr='homepage']>

B

<xsl:if test=//stsuuser:AttributeList/stsuuser:Attribute[@name='homepage']>

C

<xsl:if-exists=//stsuuser:AttributeList/stsuuser:Attribute/custom:Homepage>

D

<xsl:if-exists=//stsuuser:AttributeList/stsuuser:Attribute[@name='homepage'])>

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