Content area
Tag trackers are markers that represent positions within the XML document. To reflect the structure of the XML document, tag trackers have one parent and zero-to-many children. Starting with a root tag tracker, all other tag trackers are connected via a parent-child relationship. When a startElement SAX event occurs, the active tag tracker compares the tag name to the tag names that were associated with each of its children tag trackers when they were created. When a match is found, the active tag tracker places itself on the stack and makes the matching child tag tracker the new active tag tracker.. Later, when the child has finished processing SAX events, the parent will be popped back off of the stack and reestablished as the active tag tracker.
Tag trackers work as a group in a tag tracker network to navigate an XML document. Programs that use a tag tracker network start by creating a root tag tracker node. Then they create child tag trackers and bind them to the root tag tracker for each possible XML tag that can occur in the root of the XML document. That process is repeated recursively for each child until all XML tags in which the program is interested have a tag tracker linked to the tag tracker network. That is continued for every level in the XML document that is to be mapped. In that way, a network is created.