Hi,
I've started looking into streaming recently (using Saxon 9.9). I have
a use case like this:
Input:
<array>
<map>
<string key="key1">value1</string>
...
<string key="id">123456789</string>
...
<string key="keyN">valueN</string>
</map>
...
</array>
Required output:
<items>
<item>
<id>123456789</id>
<key>key1<key>
<val>value1</val>
</item>
...
<item>
<id>123456789</id>
<key>id<key>
<val>123456789</val>
</item>
...
<item>
<id>123456789</id>
<key>keyN<key>
<val>valueN</val>
</item>
...
</items>
The value of <string key="id"> is used as <id> in <item> elements. The
problem is that <string key="id"> can occur in any position in the
<map>.
I've tried using an accumulator such as
<xsl:accumulator name="map-id" initial-value="()" streamable="yes"
as="xs:string?">
<xsl:accumulator-rule match="/array/map/string[@key = 'id']/text()"
select="string(.)"/>
</xsl:accumulator>
and then
<item>
<id><xsl:value-of select="accumulator-before('map-id')"/></id>
...
</item>
That worked partially -- only for sibling <string> elements that
followed the <string key="id">. Which is not surprising.
I've also tried accumulator-after('map-id') but got:
XTSE3430: Template rule is not streamable
* A call to accumulator-after() is consuming when there are no
preceding consuming instructions
Is it possible to have a streaming solution in this case?
Martynas
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