querying xml xquery xpath and sql/xml in context pdf file

Querying Xml Xquery Xpath And Sql/xml In Context Pdf File

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XPath/XQuery

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Share buttons are a little bit lower. Thank you! Published by Beatrix Wilkerson Modified over 3 years ago. Querying XML documents : How to locate information in documents that are marked up using XML and how to find and extract that information in repositories of such documents. Software engineers who have to design and build applications that use XML and to access documents and data presented in an XML form.

How the book is organized. For the meaning of the tags, you need to look at the human language documentation. Example DocBook Example Document 1. Important features Descriptive markup: the idea that markup should not be procedural. Data independence: Enable faithful sharing of documents across different hardware and software platforms. XHTML 1. ID, movies. Once we have the data in a LOB, we can store it in a database table and add metadata in other columns in the table.

Then we can query the metadata to find a particular instance of a LOB or to find out information about an instance of a LOB. There are several ways to create the metadata. Some formats have metadata embedded in them. This metadata can be extracted programmatically and written into database columns as the data is inserted. Whoever publishes the data — inserts the data into a database — can add metadata via an application.

A CMS content management system will allow the publisher to add all kinds of metadata at various stages of the publishing process. Some interesting programs can produce meaningful metadata for text documents automatically, even when that metadata does not exist explicitly in the document. The metadata approach requires manual or programmatic effort to produce the metadata, then some design to figure out how to store the metadata, and finally some programming to create an application that will query the metadata in an application-specific way.

All we need to do is define an object type to represent the PDF-formatted data, and some methods that make sense for PDF. Then we can query the actual document instead of querying its metadata. The objects approach requires the definition of an object type, with methods, for each kind of data to be queried, plus an application to query that data. You can use markup to represent metadata that has been created or extracted. Adobe has taken this approach.

There is another approach — to query the nontraditional data directly, in a way that is appropriate to that kind of data. Querying XML data is different from querying relational data — it requires navigating around a tree structure that may or may not be well defined in structure and in type.

Also XML arbitrarily mixes data, metadata, and representational annotation though the latter is frowned on. We argue that knowledge of document structure and data types is a good thing and that XQuery 1. A condition — in XPath, this can be a node test or a predicate list. A node test is used to test either the name of the node or its kind element, attribute, comment, etc.

A predicate tests either the position of the node as the N-th child child nodes are numbered starting from 1 or it tests the value of the node.

If you want to do anything with the results, you need to serialize the results, i. On the other hand, document-centric XML documents, such as books, articles, and papers, rely heavily on document order. Without document order, XML authors would have to number every chapter, section, paragraph, bolded term, etc. The condition holds if the sequences are identical — i. XPath 1. An element node might contain just text like familyName , or it might be a complex element, containing subelements like movie.

If you want to know whether two nodes are equal, you might choose: Two nodes are equal if their string values all the text content between the start and end tags of the element are equal. Two nodes are equal if they have the same children, in the same order, and those children are equal. Two nodes are equal if they are the same node — that is, you are not comparing two different nodes that happen to have the same content, but you are comparing the exact same node with itself i.

XQuery 1. When querying XML, we are often dealing with sequences ordered lists rather than single items, and the items in a sequence may be values strings, integers, dates, … or nodes elements, complex elements such as those containing child elements, attributes, … , or a mixture of values and nodes.

Expression 2 Attributes vs. Elements Attributes are different from elements they have different properties , and XML query languages should and do treat elements and attributes differently. For example, attributes have no implicit order, they cannot have children, and they do not have a parent-child relationship with the element they appear in. In fact, XML documents typically contain content plus metadata plus marked-up content. At best, tag names merely give some hints about what the data represents.

To write a SAX program you will need to obtain a SAX XML parser and then register an event handler to define a callback method for elements, for text, and for comments.

That is, StAX lets you pull the next item in the document as it parses. What is XML? XML was designed to describe. Organizing Information Digitally Norm Friesen.

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Querying XML: XQuery, XPath, and SQL/XML in Context

XPath is a language based on path expressions and allows the selection of parts of a given XML document. In addition it also allows some minor computations resulting in values such as strings, numbers, or booleans. The semantics of the language is based on a representation of the information content of an XML document as an ordered tree. An XPath expression consists usually of a series of steps that each navigate through this tree in a certain Skip to main content Skip to table of contents. This service is more advanced with JavaScript available. Editors: Reda Alhajj, Jon Rokne.

Queries Are Restricted to XPath 1. Incidental Limits of the Implementation. Restriction of XQuery to XPath. XPath can create and return values of the atomic types numbers, strings, and so on but can only return XML nodes that were already present in documents supplied as input to the expression. XQuery has control constructs for iteration, sorting, and grouping. XQuery allows declaration and use of local functions.

Faster previews. Personalized experience. Get started with a FREE account. XML for Dummies 4th Ed. Load more similar PDF files. PDF Drive investigated dozens of problems and listed the biggest global issues facing the world today.


Master the basics of XML as well as the namespaces and objects you need to know in order to work efficiently with XML. Y.


Querying XML: XQuery, XPath, and SQL/XML in Context

This section presents an overview of the XQuery language. XPath models an XML document as a tree of nodes. It provides a set of operations that walk this tree and apply predicates and node-test functions. Table lists some common constructs used in XPath. Denotes the root of the tree in an XPath expression.

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Haynes ManualsThe Haynes Author : Jim Melton, Stephen Buxton """Description:XML has become the lingua franca for representing business data, for exchanging information between business partners and applications, and for adding structure-and sometimes meaning-to text-based documents. XML offers some special challenges and opportunities in the area of search: querying XML can produce very precise, fine-grained results, if you know how to express and execute those queries. For software developers and systems architects: this book teaches the most useful approaches to querying XML documents and repositories. This book will also help managers and project leaders grasp how ""querying XML"" fits into the larger context of querying and XML.

В трубке повисло молчание. - Мидж… - Джабба попробовал извиниться.  - Позволь мне объяснить.

Querying XML: XQuery, XPath, and SQL/XML in Context

Хотя в последнее мгновение Беккер увернулся, Халохот сумел все же его зацепить. Он понимал, что пуля лишь слегка оцарапала жертву, не причинив существенного ущерба, тем не менее она сделала свое. Контакт был установлен.

Чем могу служить. Беккер держался той же версии: он - немецкий турист, готовый заплатить хорошие деньги за рыжеволосую, которую сегодня нанял его брат. На этот раз ему очень вежливо ответили по-немецки, но снова сказали, что рыжих девочек у них. - Keine Rotkopfe, простите.  - Женщина положила трубку. Вторая попытка также ни к чему не привела. Беккер заглянул в телефонный справочник.

 Должно ведь быть какое-то объяснение. - Оно есть, - кивнул Стратмор.  - Тебя оно не обрадует.

Хейл хмыкнул. Сьюзан уже привыкла к агрессивному поведению Хейла.

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3 Comments

  1. Blanchefle L.

    We think you have liked this presentation.

    28.03.2021 at 11:19 Reply
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    31.03.2021 at 14:31 Reply
  3. Henriette G.

    XQuery XML Query is a query and functional programming language that queries and transforms collections of structured and unstructured data , usually in the form of XML , text and with vendor-specific extensions for other data formats JSON , binary , etc.

    04.04.2021 at 20:34 Reply

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