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280 11 The XML Transformation Language

11.8 Exercises

The following exercises use the BioML example in figure 1.3. Each exercise

is solved with one or two templates that transform the kinds of elements

mentioned in the exercise. Each of the solutions is an XSLT program having

the following form:

<xsl:transform version=’1.0’

xmlns:xsl=’http://www.w3.org/1999/XSL/Transform’>

<!-- The answer to the exercise goes here. -->

<!--

This template copies all elements and attributes

that do not appear in the template(s) above.

-->

<xsl:template match="@*|node()">

<xsl:copy>

<xsl:apply-templates select="@*|node()"/>

</xsl:copy>

</xsl:template>

</xsl:transform>

1. Copy thelocusname attribute so that it is an attribute ofgene.


2. Remove alllocuselements, and move anyreferenceelements from
   being child elements of thelocuselement to being child elements of the
   geneelement.


3. Change the BioML example to have a striping layer betweenorganism
   andchromosomeas shown in figure 1.14.


4. Change thereferenceelements to be eitherisStoredInorisCited
   Bydepending on whether the reference is to a sequence database or to a
   literature reference.


5. Infer the EMBL sequence number and the organism of each gene, adding
   them to thegeneelement as attributes.


6. For each gene, compute the total length of all exons that it contains. Com-
   pare your solution with your solution to exercise 11.8.