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# BDB::XML

Berkeley DB XML is an embedded native XML datastore that provides for the efficient storage and retrieval of XML encoded information.

Retrieval is supported by an XPath query engine that derives its efficiency from indices generated from the stored XML data.

BDB::XML::Container

The container name provides the base for the filenames of the database files used to store the container content. The directory within which the files are opened is taken from the environment passed through the Container constructor. If no environment was provided, then the directory used will be the current working directory.

BDB::XML::Index

Define the indexing strategy for a Container

Indexing is specified by providing the name of a node and a list of indexing strategies for that node.

BDB::XML::Document

A Document is the unit of storage within a Container.

A Document contains a stream of bytes that may be of type XML. The Container only indexes the content of Documents that contain XML.

Document supports annotation attributes.

BDB::XML::Context

The context within which a query is performed against a Container.

The context within which a query is performed against a Container is complex enough to warrent an encapsulating class. This context includes a namespace mapping, variable bindings, and flags that determine how the query result set should be determined and returned to the caller.

The XPath syntax permits expressions to refer to namespace prefixes, but not to define them. The Context class provides a number of namespace management methods so that the caller may manage the namespace prefix to URI mapping.

The XPath syntax also permits expressions to refer to variables, but not to define them. The Context class provides a number of methods so that the caller may manage the variable to value bindings.

BDB::XML::Modify

Modify encapsulates the context within which a set of documents specified by a query can be modified in place.

The modification is performed using the methods BDB::XML::Container#modify and BDB::XML::Document#modify

There are two parts to the object -- the query and the operation. The query identifies target nodes against which the operation is run. The operation specifies what modifications to perform.

BDB::XML::Results

The results of a query are a collection of values. The values could be either String, Float, true, false, BDB::XML::Documents or BDB::XML::Nodes

Implement only the method each