xmlparsing - Online Linux Manual PageSection : 3
Updated : Mon Jan 25 2021
Source : Version 4.0.0
Note : Coin
NAMExmlparsing − XML Parsing with Coin For Coin 3​.0, we added an XML parser to Coin​. This document describes how it can be used for generic purposes​. Why another XML parser, you might ask? First of all, the XML parser is actually a third-party parser, expat​. Coin needed one, and many Coin-dependent projects needed one as well​. We therefore needed to expose an API for it​. However, integrating a 3rd-party parser into Coin, we can not expose its API directly, or other projects also using Expat would get conflicts​. We therefore needed to expose the XML API with a unique API, hence the API you see here​. It is based on a XML DOM API we use(d) in a couple of other projects, but it has been tweaked to fit into Coin and to be wrapped over Expat (the original implementation just used flex)​. The XML parser is both a streaming parser and a DOM parser​. Being a streaming parser means that documents can be read in without having to be fully contained in memory​. When used as a DOM parser, the whole document is fully parsed in first, and then inspected by client code by traversing the DOM​. The two modes can actually be mixed arbitrarily if ending up with a partial DOM sounds useful​. The XML parser has both a C API and a C++ API​. The C++ API is just a wrapper around the C API, and only serves as convenience if you prefer to read/write C++ code (which is tighter) over more verbose C code​. The C API naming convention may look a bit strange, unless you have written libraries to be wrapped for scheme/lisp-like languages before​. Then you might be familiar with the convention of suffixing your functions based on their behaviour/usage meaning​. Mutating functions are suffixed with '!', or '_x' for (eXclamation point), and predicates are suffixed with '?', or '_p' in C​. The simplest way to use the XML parser is to just call cc_xml_read_file(filename) and then traverse the DOM model through using cc_xml_doc_get_root(), cc_xml_elt_get_child(), and cc_xml_elt_get_attr()​. See also XML related functions and objects, cc_xml_doc, cc_xml_elt, cc_xml_attr 0
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