If you are using Xerces as your XML parser, you can have Xerces expand any XInclude directives.
-xi option on the command line causes XInclude processing to be applied to
most input XML documents. This includes source documents and schema documents
listed on the command line, and also those loaded indirectly for example by calls on the
doc() function or by mechanisms such as
xs:import. It does not, however, affect the parsing of XSLT stylesheet modules.
From the Java API, the equivalent is to call
setXInclude() on the
Configuration object, or to set the configuration property XINCLUDE to true.
XInclude processing can be requested at a per-document level by creating an AugmentedSource and calling its
setXIncludeAware() method. The corresponding method is also recognized on
Saxon's implementation of the JAXP
DocumentBuilderFactory. When the
collection() function is
called from an XPath expression, XInclude processing can be enabled by including
xinclude=yes among the query parameters in the URI.
It is possible to request XInclude processing for the documents in a collection by including
the query parameter
xinclude=yes in the collection URI. Similarly, for a document
read using the
document() functions, XInclude processing can
be requested using
xinclude=yes in the document URI -- but only if the
StandardURIResolver is used, and the feature is enabled by calling
Configuration.setParameterizedURIResolver() or by setting
Transform command lines.
instruction can enable XInclude processing using
the extension attribute
It is also possible to switch on XInclude processing (for all documents) by setting the system property:-Dorg.apache.xerces.xni.parser.XMLParserConfiguration= org.apache.xerces.parsers.XIncludeParserConfiguration
An alternative approach is to incorporate an XInclude processor as a SAX filter in the input pipeline. You can find a suitable SAX filter at http://xincluder.sourceforge.net/, and you can incorporate it into your application as described in Writing input filters.
On the .NET platform, there is a customized
XmlReader that performs XInclude
processing available at GitHub project Mvp.Xml.NetStandard. You can supply this as an argument to the method
Build(XmlReader parser) in the DocumentBuilder class of the .NET Saxon API. (Not tested).
For further information on using XInclude, see http://www.sagehill.net/docbookxsl/Xinclude.html.