formatting the number may get you a bit further, but eventually you'll
get to a range where adding 1 doesn't change the value (as a double)
try
<object_id>1111111111111111111</object_id>
for example.
If you are using xslt you can use the xs:integer type for integers.
<xsl:template match="blueprint">
: <xsl:value-of select="1+marker_object/object_id"/>
: <xsl:value-of select="format-number(1+marker_object/object_id,'#0')"/>
: <xsl:value-of select="1+xs:integer(marker_object/object_id)"/>
</xsl:template>
makes
$ saxon8 int.xml int.xsl
<?xml version="1.0" encoding="UTF-8"?>
: 1.1111111111111112E18
: 1111111111111111168
: 1111111111111111112
for example.
In XSLT1 you'd have to work a bit harder, implementing decimal encoded
addition using string handling.
David
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