I/O Write

Elements and attributes can be associated with iterators, either by listening to them, or by calling next() on them directly. The next two examples show elements that call next() directly. The containers example uses listeners.

The first example has one element, and generates:

    10 11 12 13 14 15 16 17 18 19
  

The element named element0 writes to writer0, which writes to stdout. The output format is CSV, defined by formatter0. The element's attribute gets its values by calling next() on iter0.

    
    <dm:ints range="[10]">
      <dm:iterator id="iter0"/>
    </dm:ints>
    <dmio:stream-writer id="writer0" stream="stdout"/>
    <dmio:csv-format id="formatter0"/>
    <dmio:element id="element0"  writer="writer0" formatter="formatter0">
      <dmio:attribute iterator="iter0"/>
    </dmio:element>
    
  

In this next example, element1 writes to stdout in XML format. Each XML element that is output is named A. The element has four attributes:

• The first attribute is named a, and gets its values by calling next() on an embedded collection whose range is [10]2.
• The second attribute is named b, and gets its values from the iterator whose id is iter1.
• The third attribute is named c, and gets its values from an iterator on the ints collection whose id is ints1.
• The fourth attribute is named d, and gets its values from the same iterator as attribute b. Note that it gets the iterator's current value, and so writes the same value as b.

    
    <dm:ints id="ints1" range="[10]3">
      <dm:iterator id="iter1"/>
    </dm:ints>

    <dmio:element id="element1" name="A">
      <dmio:stream-writer stream="stdout"/>
      <dmio:xml-format/>

      <!-- a -->
      <dmio:attribute name="a">
	<dm:ints range="[10]2"/>
      </dmio:attribute>

      <!-- b -->
      <dmio:attribute name="b" iterator="iter1"/>

      <!-- c -->
      <dmio:attribute name="c">
	<dm:iterator collection="ints1"/>
      </dmio:attribute>

      <!-- d -->
      <dmio:attribute name="d" iterator="iter1" current="true"/>

    </dmio:element>
    
  

The result is:

    
    <A a="10" b="10" c="10" d="10"/>
    <A a="12" b="13" c="13" d="13"/>
    <A a="14" b="16" c="16" d="16"/>
    <A a="16" b="19" c="19" d="19"/>
    <A a="18" b="22" c="22" d="22"/>
    <A a="20" b="25" c="25" d="25"/>
    <A a="22" b="28" c="28" d="28"/>
    <A a="24" b="31" c="31" d="31"/>
    <A a="26" b="34" c="34" d="34"/>
    <A a="28" b="37" c="37" d="37"/>