Assignment #5: Scripted XML Processing Pipelines

due: Wednesday, Nov 16

Write a DTD and an interpreter for the scripting language consisting of the following instructions.

load the XML file and associate it with the given name.
<get name="..." file="..." />
Associate a name to the given enclosed code.
<set name="...">
<![CDATA[
...
]]>
</set>
Execute the enclosed instructions provided the named XML code satisfied the named DTD conditions.
<if xml="..." dtd="..." root="..." >
...
</if>
Associate a name to the result of applying the named XSLT transformation on the named XML code.
<xslt name="..." xml="..." xsl="..." />

Note that an XSLT file is just a restricted kind of XML code.
Associate a name to the result of applying the named method on the DOM of the named XML code.
<dom name="..." xml="..." method="..." class="..." />
Associate a name or a filename to an output of the specified content-handler applied on the named XML content.
<sax name="..." xml="..." content-handler="..." />

If the xml attribute is not internally known, a file name is assumed. If the name attribute is missing the returned value is ignored.
Prints the content of the named XML code. The file attribute is optional, and stdio is assumed when a file name is not provided.
<print name="..." file="..." />
A script should be enclosed within a ‘pipeline’ element.
<pipeline> ... </pipeline>
A script should be prepended by a DOCTYPE instruction pointing into a file holding a DTD for the scripting language.