Introduction to XML and native XML technologies on the IBM ...

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From Zero <strong>to</strong> z Hero - z/OS und <strong>XML</strong> - Das perfekte DuoBuffers usages <strong>and</strong> flow in <strong>XML</strong> System Services• Every initialization has been done <strong>and</strong> theparse can takeplace• For the moment, assume that validationis not required.• On the left side a <strong>XML</strong> string is provided<strong>to</strong> the parse.• In this example, assume that thecomplete document is <strong>to</strong>o large <strong>to</strong> beread in<strong>to</strong> a single buffer.• The reader function of the application fillsa buffer <strong>and</strong> advances this as parsingprogresses.• Logically, the reader slides a bufferwindow over the <strong>XML</strong> string.• The address of the position of the windowis passed <strong>to</strong> z/OS <strong>XML</strong> System Servicesroutine gxlprs(), which is the parsingroutine. A• lso passed <strong>to</strong> gxlprs() is the address ofan output buffer where the results ares<strong>to</strong>red.© 2012 IBM Corporation
From Zero <strong>to</strong> z Hero - z/OS und <strong>XML</strong> - Das perfekte Duoz/OS <strong>XML</strong> System Services parsed data stream• The parsed <strong>XML</strong> data streamcontains unique record typeidentifiers for the different• components within an <strong>XML</strong>document. Among the recordtypes are:– <strong>XML</strong> declaration, whenpresent– Start of an element– Character value for anelement, when present– End of an element– Name of an attribute– Value of an attribute– Namespace declaration© 2012 IBM Corporation
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Introduction to XML and native XML technologies on the IBM ...

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