barcode generator in vb.net 2005 PART VI in Software

Encoder QR Code in Software PART VI

PART VI
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Part VI:
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Either type of XML parser will validate that an XML document is well formed, and can also validate an XML document against a schema, as described in the XML Schema section later in this chapter. A DOM parser is practical when the size of the stored XML document is fairly small; it will require double the memory space of the text XML document, because it generates a second, tree-structured representation of the entire document. For very large documents, a SAX parser makes it easy to process documents in small, discrete pieces. However, the fact that the entire document is not available at one time may require a program to make multiple passes through it, if the program needs to process various sections of the document out of sequential order. Storing XML documents as large objects within a database is an excellent solution for some types of SQL/XML integration. If the XML documents are, for example, text-oriented business documents, or if they are text components of web pages, then there is really very little need for the DBMS to understand the internals of the XML documents. Each document can probably be identified by one or more keywords or attributes, which can easily be extracted and stored as conventional columns for searching. If the XML documents to be processed are really data processing records, however, the simple integration provided by large objects may be too primitive. You will probably want to process and access individual elements, and search based on their contents and attributes. The DBMS already provides these capabilities for its native row/column data. Why can t the DBMS automatically decompose an incoming XML document, transforming its element contents and attribute values into a corresponding set of internal row/column data for processing On the outbound side, we have already seen how this approach can work to transform row/column query results into an XML document. The same technique could be used to recompose an XML document if it were once again needed in its external text form. The challenge of transforming XML documents, which are an excellent external data representation, to and from internal data representations more useful for programs is not unique to database systems. The same problems occur, for example, in Java processing of XML, where it is very desirable to transform an XML document to and from a set of Java class instances for internal processing. The process of decomposing an XML document into its component elements and attributes in some internal, binary representation is called unmarshaling in the XML literature. Conversely, the process of reassembling these individual element and attribute representations into a complete text XML document is called marshaling. For very simple XML documents, the marshaling and unmarshaling process is straightforward, and commercial DBMS products are moving to support it. Consider once again the simple purchase order document in Figure 25-3. Its elements map directly, one to one, onto individual columns of the ORDERS table. In the simplest case, the names of the elements (or attributes) will be identical to the names of the corresponding columns. The DBMS can receive an inbound XML document like the one in the figure and automatically turn its elements (or attributes, depending on the style used) into column values, using the element names (or attribute names) to drive the process. Reconstituting the XML document from a row of the table is also no problem at all. The DBMS must do slightly more work if the element names in the XML document don t precisely match column names. In this case, some kind of mapping between element names (or attribute names) and column names must be specified. It s relatively straightforward to put such a mapping into the DBMS system catalog.
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