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I had a specific problem I set out to solve, but the technique described in this article can be used to customize the behaviour of JAXP document builder factories that are used by code you cannot change by setting other features and properties on such document builder factories.
I first saw the problem with JAXP wanting to read a DTD document referenced from an XML document when I created a mapping from one XML format to another using the Mule Data Mapper. Schema; /** * JAXP document builder factory that disables loading of external DTDs * when reading XML documents using document builders created by this * factory.
Attributes that were read in from defaults in the DTD will be explicitly specified.
However, the complete information content of the original document should be present, even if the form is different.
The names of these features begin with URLs somewhere in the parser vendor’s domain.
For example, non-standard features of the Xerces parser from the XML Apache Project begin with because you can’t turn on validation halfway through a document.
at line 344, column 92 Error: Attribute "href" must be declared for element type "xinclude:include".
Attempting to set this to true with a parser that cannot resolve external entity references will throw a is true, then the parser resolves all external parameter entity references. If the parser is validating, then this feature is required to be true.
Features and properties can be read-only, write-only (rare), or read-write.
If you attempt to change a read-only feature or property, a However, different parsers also support non-standard, custom features.
As described in the Java API documentation of the Since I do not have control over the XML fragments that are received and did not want to revert to string-manipulation of incoming XML data, I made some research and found the following two features available in the Xerces XML parser that Java uses: Given that Java system properties can be manipulated programmatically at runtime, I came up with the idea to dynamically replace the current document builder factory with a wrapper that sets certain features on new instances of the document builder factory.
Setting those features were said to cause references to DTD documents to be ignored when parsing XML that contained such references.