Example

The following example illustrates the usage of extract and literal expressions. Consider the following element:

<parent>

<child-A t="A1">A1 text</child-A>

<child-B t="B1">

<gc-Y t="Y1">Y1 text</gc-Y>

<gc-Z t="Z1">Z1 text</gc-Z>

<gc-Z t="Z2">Z2 text</gc-Z>

</child-B>

<child-A t="A2">A2 text</child-A>

<child-B t="B2">

<gc-Z t="Z3">Z3 text</gc-Z>

<gc-Z t="Z4">Z4 text</gc-Z>

</child-B>

</parent>

Let the following mapping rule match the <parent> element above. (Again, we do not specify which elements the mapping rule contains – for the purpose of this example, we only need to know that some of these elements use the expression elements.)

<mapping match="parent">

...

	<!-- e1 -->

	<extract expr="./child-A"/>

...

	<!-- e2 -->

	<extract expr="./child-A{1}"/>

...

	<!-- e3 -->

	<extract expr="./child-A{1}[@t]"/>

...

	<!-- e4 -->

	<extract expr="./child-B[@t]"/>

...

	<!-- e5 -->

	<extract expr="./child-B/gc-Y"/>

...

	<!-- e6 -->

	<extract expr="./child-B/gc-Y[@t]"/>

...

	<!-- e7 -->

	<extract expr="./child-B{2}/gc-Z{2}[@t]"/>

...

	<!-- e8 -->

	<extract expr="./child-A{2}"/>

...

	<!-- e9 -->

	<extract expr="./child-B{2}[@t]"/>

...

	<!-- l -->

	<literal expr="this is literal data"/>

	</mapping

Then:

e₁ extracts A1 text.

e₂ extracts A1 text.

e₃ extracts A1.

e₄ extracts B1.

e₅ extracts Y1 text.

e₆ extracts Y1.

e₇ extracts Z4.

e₈ extracts A2 text.

e₉ extracts B2.

l has the literal value this is literal data.