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Getting Started with Oracle Event Processing 11g
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With the progress of web services and XML technologies, it is not uncommon for an Oracle CEP application to have to receive and output XML documents as part of event processing. Let's start our study of how to work with XML in CQL by first tackling the case where queries need to output strings containing valid XML documents.
XML Primer
Here is a quick primer on the XML vocabulary. Using the following XML as a reference:
<docElem>
<elementAattributeA="v1">content</elementA>
<elementBattributeB="v2">content</elementB>
</docElem>The tags <docElem>, <elementA>, and <elementB> are called XML elements. XML elements contain content between their start (<elementA>) and end tag (</elementA>), which can be other XML elements, or just character data.
The tag <docElem> is the root of the document and is called the document element. Proper XML documents must have a single root. Unrooted XML are called...
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