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OpenTop C++
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OpenTop XML

OpenTop contains a native C++ XML Parser. At first glance, parsing XML appears to be a trivial matter. However, in reality, correctly parsing XML documents is a demanding task - so much so that many of the advanced networking, Unicode and resource management features built into OpenTop originate from requirements generated by the XML parser project.

The OpenTop XML parser is fast, efficient and fully conformant with the W3C XML Recommendation. This is regularly verified using the OASIS/NIST XML Conformance Test Suite.

The OpenTop SAX Interface

The primary interface to OpenTop's validating XML parser is based on the de-facto industry-standard SAX 2.0 interface.

Apart from being a well-documented and widely adopted standard, one of the main attractions of SAX is that it is extremely efficient, taking minimal memory or processor resources.

The SAX specification originated in the Java world, so there is no official C++ definition. However, OpenTop provides a true implementation of SAX and only deviates from the Java interfaces where the C++ language offers a more efficient solution.

In common with the rest of OpenTop, this is a professionally supported product and the full source code is supplied.


Applications which use XML external entities (such as DTDs or sub-document inclusion) rely on the XML parser resolving the entity's system name into an available resource. For some documents, such as XHTML, this can lead to the XML parser needing to access resources from the network.

The OASIS XML Catalogs specification defines a way for applications to override the declarations within an XML document to point the processor at an alternative (local or remote) resource. Applications typically use this feature to redirect network resources to a locally cached copy.

OpenTop was one of the fist commercial libraries to fully implement the XML Catalog specification.

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