Understanding Input Ports

Stylus Studio interprets input ports differently for different XSLT instructions, as shown in Table 69:

Table 69. XSLT Instruction Blocks in XSLT Mapper
XSLT Instruction	Meaning of Input Port
xsl:value-of	Used to define the value of the `select` attribute. For example: `<xsl:value-of select="'Owen'">`
xsl:for-each	Used to define the XPath expression for the `select` attribute. For example: `<xsl:for-each select="books/book">`
xsl:if	Used to define the value of the `test` attribute. For example: `<xsl:if test="authors/author= 'Henry'">` See xsl:if and xsl:choose to learn more about when to use this instruction.
xsl:choose	Used to define the value of the `test` attribute of the nested `xsl:when` element. For example: `<xsl:when test="contains(authors/author,'Marchese')">` See xsl:if and xsl:choose to learn more about when to use this instruction.
xsl:apply-templates	Used to define the value of the `select` attribute. For example: `<xsl:apply-templates select="subject"/>`
xsl:call-template	Used to define the value of the `name` attribute. For example: `<xsl:call-template name="newAuthorsTemplate"/>`

Specifying Values for Input Ports

You can specify values for input ports by:

Dragging a link from a source document node or from the output port of another block (like that of an XPath function or If block, for example).

Double-clicking the port and typing a value (a string or an XPath expression, for example) in the Value dialog box.


Tip		When you mouse over an input port, Stylus Studio displays the value associated with that port.

Red Input Ports

If an xsl: instruction's attribute takes a literal or string value (such as xsl:value-of select="'Recommended'"/, for example) and a value has been provided for the attribute, Stylus Studio fills the input port associated with that attribute with a deep red to indicate that a value has been specified.

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