Dynamic Mashup Expressions

Mashables and Mashups : Mashups in EMML : Expressions for Mashups : Dynamic Mashup Expressions

Dynamic Expressions in XPath Expressions

Dynamic mashup expressions provide dynamic content in a mashup script. You can use dynamic mashup expressions:

In literal XML: to define the data to fill the mashup result, variable or parameter that is being constructed. See Dynamic Expressions in Literal XML for examples

In most XPath expressions or EMML attributes that accept an XPath expression: This can replace the entire XPath expression or any part of the XPath expression.

Note:

You cannot nest dynamic mashup expressions. So you cannot use a dynamic mashup expression in an XPath inside a dynamic mashup expression for literal XML. This can be useful to make any EMML statement dynamic including macros. See Dynamic Expressions in XPath Expressions and <macro> for examples.

In <template> elements to build syntax or any string dynamically: This is commonly done to build a dynamic expression to use as input parameters for a generic mashup script or generic macro. But you can use the <template> element to build any string dynamically within a mashup script or macro. See Dynamic XPath or Other Syntax in Mashups for examples.

In <constructor> or <appendresult>: with XQuery expressions. See Using XQuery Expressions in Construction Statements for examples.

Dynamic expressions are XPath expressions enclosed in braces ( { expression } ). Variable references start with $ in dynamic mashup expressions. For example:

{$filterResult/list/name}
{upper-case($list/memberName)}
{$selectedItem}[matches(description, 'Ruby')
Hello, my name is {$currentUser}!]

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