4. XML schema refs,
XSLT
PB138
Homework
● Deadline is 1.4.2013 23:59
Schema Uniqueness and Keys
<people>
<person id="0" />
<person id="1" parentId="0"/>
<person id="2" />
</people>
Must be inside <xs:element>!
<xs:element name="people" >
<xs:unique name="myUniq">
<xs:selector xpath="./ns:person"/>
<xs:field xpath="@id"/>
<xs:field xpath="xxxx"/>
</xs:unique>
...
xs:unique
Must be inside <xs:element>!
<xs:element name="people" >
<xs:key name="myPk">
<xs:selector xpath="./ns:person"/>
<xs:field xpath="@id"/>
<xs:field xpath="xxxx"/>
</xs:key>
...
xs:key
xs:keyref
<xs:keyref name="parentId"
refer="myPk">
<xs:selector xpath="./ns:person"/>
<xs:field xpath="@parentId"/>
...
Difference between key and unique
● The selector for unique doesnt need to
contain the fields
Task
● Task1: Ensure the id is unique across
messages. Create attribute
"relatedMessage" which is a foreign key to
uniqueId
● Task2: Ensure that message IDs are unique
only across channels
XSLT
● messages.xml + messages.xslt = result.xml
● XSLT is composed of templates.
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.
org/1999/XSL/Transform">
<xsl:template match="/">
Running the Transformation
● Try transformation from Netbeans and from
Java
● HELLO WORLD
Basic Transformations
● / vs /messages
● Evaluation of the algorithm
○ apply-templates will again apply the whole template
file to each child
○ text() matching
● The implicit templates
○ We can override them!
Implicit Templates
<xsl:template match="*|/">
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="text()|@*">
<xsl:value-of select="."/>
</xsl:template>
Functional calling
● create a table "id, text"
○ sms text in red color
○ other text in blue
Modes, foreach and IFs
● Write out SMS first!
● <xsl:choose>
● <xsl:if>
● <xsl:for-each>
Other important concepts
● xsl:sort
● xsl:element
● xsl:call-template (with parameters)