Sources

As described in Working with Data Sources, if you plan on generating XSLT for your XML Publisher report you must have specified at least one default source. (Sources are not required for generating XQuery, though it is considered good practice to specify one.)

Additional Sources

You can specify multiple sources for an XML Publisher report. The first source is specified in the XSLT/XQuery Scenario Properties dialog box as shown in the following table.

Table 175. How Additional Source Documents Are Referenced
Language Type	Scenario Property	Referenced in Generated Code As
XSLT	Source XML URL	A global parameter: `xsl:param name="input1"`
XQuery	Main Input	An external variable: `declare variable $input1 as document-node() external`

The expression associated with these variable names is displayed on the Parameter Values page of the Scenario Properties dialog box, like the one shown for XQuery scenarios in Figure 526.

Figure 526. Additional Sources Displayed on XQuery (XSLT) Scenario Properties

As you can also see, Figure 526 shows how data sources specified in XML Publisher are represented in the XQuery (and XSLT) editor. This XQuery uses three XML sources:

videos.xml (it is the default source)

A relational source from the pubs data base

A local copy of books.xml, displayed on the XQuery data sources panel using the variable name, $input1, with which it is associated