who can give me some advice on sum()?

[ywj]

Hi, everyone     This is the first time that I mail to mailto:[EMAIL PROTECTED] It is so nice that I can communicate with you.     My question is that:     I use sum() in XSLT file to add up the float(or double) content of some nodes in xml file, but the result of sum is not like what I expected.     For example:         The fragment of xml file:            <b>             <a>1.11</a>             <a>2.22</a>             <a>3.33</a>             </b>         The fragment of xslt file:             <xsl:value-of select = "sum(b/a)" />         the result value is not 6.66, but 6.6600000000003.       I use xalan-j_2_2_D14 and jdk1.3.1.     I know one of the way is to use round(), but I do not know I should keep how many digits after decimal point if the xml file is created dynamically. Who can give me some advice?     Thank you very much!       regards   yang Wenjun