XSLT(10) Sequence

Type

Sequences have types, types can have occurrence indicators + * ?

example:

xs:dateTime+

element(Series)

xs:anyAtomicType*

Testing types:

item() - test any item

void() - empty sequence

<xsl:sequence>

, xsl:sequence can return a sequence containing existing nodes, rather than constructing new nodes like <xsl:copy-of>. The items comprising the result sequence are selected using the select attribute. When xsl:sequence is used to add atomic values to a sequence, the effect is very similar to the xsl:copy-of instruction.

<xsl:variable name="values" as="xs:integer*">    <xsl:sequence select="(1,2,3,4)"/>    <xsl:sequence select="(8,9,10)"/></xsl:variable><xsl:value-of select="sum($values)"/>

output: 37

Testing Sequence

exists() empty()

Test whether a sequence is empty or not use exists() orempty()

instance of

Test whether a sequence is of a specific type

index-of()

If the sequence contains multiple instances of the specified value, then index-of() returns a sequence containing the positions in which the value appears. If the sequence doesn’t contain the given value, then index-of() returns an empty sequence.

The index-of() function is most useful when you’re using sequences to hold structured data.

Outputting Sequences

<xsl:for-each>

<xsl:apply-template>

<xsl:value-of>