xslt 1 和求和函数
我使用 xml 和 PHP 创建了一个发票管理系统，但最新的 PHP 版本不支持 XSLT 2.0 - 因此我必须寻找 sum() 替代方案.如何将有效的 xslt 2 函数 "sum(unitprice * quantity)" 转换为 xslt 1.0 ?
I create an invoice management system using xml and PHP but the latest PHP version does not support XSLT 2.0 - therefore I have to look for an sum() alternative. How can I transform the valid xslt 2 function "sum(unitprice * quantity)" to xslt 1.0 ?
XML 内容基于 John 的示例
我用节点集尝试过，但不支持xmlXPathCompOpEval: function node-set not found in"
I tried it with a node-set, but it is not supported "xmlXPathCompOpEval: function node-set not found in"
推荐答案
实际上，sum(price*quantity) 不是有效的 XSLT 2.0 语法.我猜你的意思是 `sum(for $x in * return $x/price*$x/quantity).
Actually, sum(price*quantity) isn't valid XSLT 2.0 syntax. I guess you mean something like `sum(for $x in * return $x/price*$x/quantity).
对 XSLT 1.0 中的计算值求和可以通过以下方式完成:
Summing over a computed value in XSLT 1.0 can be done in the following ways:
两遍解决方案，创建一个节点集，其中节点保存计算值，然后对节点集求和
two pass solution, create a node-set in which the nodes hold the computed values, then sum over the node-set
递归解决方案:编写一个递归模板，将total作为参数传递，为当前节点添加sum*quantity，然后递归处理剩余节点
recursive solution: write a recursive template that passes the total so far as a parameter, adds sum*quantity for the current node, then recurses to process the remaining nodes
高阶解决方案:使用 Dimitre Novatchev 的 FXSL 库
higher-order solution: use Dimitre Novatchev's FXSL library
扩展解决方案:使用扩展函数，如 saxon:sum()
extension solution: use extension functions like saxon:sum()
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