Re: [xsl] streaming XSLT creating a header from a first record

["Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

On 08.05.2018 18:04, Michael Kay mike@xxxxxxxxxxxx wrote:
> I don't think you need two accumulators, you can have a single accumulator that matches every row and only creates the map if the current value is an empty map.

Taking up that idea I tried also to construct a streaming accumulator 
that stores a (shallow) copy of the first row element and a deep copy of 
its attributes:

	<xsl:accumulator name="first-row-copy" as="element(row)?" 
initial-value="()" streamable="yes">
		<xsl:accumulator-rule match="table/row">
			<xsl:choose>
				<xsl:when test="empty($value)">
					<xsl:copy>
						<xsl:copy-of select="@*"/>
					</xsl:copy>
				</xsl:when>
				<xsl:otherwise>
					<xsl:sequence select="$value"/>
				</xsl:otherwise>
			</xsl:choose>
		</xsl:accumulator-rule>
	</xsl:accumulator>

Seems to also work fine. So in that case one doesn't need to switch 
between XML and maps when processing the stored value but can continue 
to use the traditional XSLT processing of XML.