This program illustrates how an application can use the SAX EntityResolver
handler to redirect the input stream for external entities. It installs an entity
resolver, traps the call to the external DTD file and redirects it to another
file which contains the actual DTD.
The program then counts and reports the number of elements and attributes in
the given XML file.
Redirect is invoked as follows:
 | | |
| cd xerces-c-3.3.0/samples/data
Redirect personal.xml | |
| | |
The output is the following:
| | |
| cd xerces-c-3.3.0/samples/data
Redirect personal.xml
personal.xml: 30 ms (37 elems, 12 attrs, 0 spaces, 268 chars) | |
| | |
External files required to run this sample are 'personal.xml', 'personal.dtd' and
'redirect.dtd', which are all present in the 'samples/data' directory. Make sure
that you run redirect in the samples/data directory.
The 'resolveEntity' callback in this sample looks for an external entity with
system id as 'personal.dtd'. When it is asked to resolve this particular external
entity, it creates and returns a new InputSource for the file 'redirect.dtd'.
A real-world XML application can similarly do application specific processing
when encountering external entities. For example, an application might want to
redirect all references to entities outside of its domain to local cached copies.
 | The time reported by the program may be different depending on your
processor speed. |
