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Eve Maler has written:
'Developing SGML DTDs' -- subject(s): Electronic publishing, SGML (Document markup language), Hypertext systems, DTDs, DTD project management
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An xml schema is written using the syntax and specifications of xml.
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An HTML validator is used to check the validity or syntactical correctness of a fragment code or document. It also technically refers to validation using DTDs by SGML tools.
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No, Document Type Definitions (DTDs) do not support true inheritance like object-oriented programming languages. However, they do allow for entity declarations that can be reused across different model structures, providing a level of modularity and reuse but not direct inheritance.
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DTD (Document Type Definition) is still used in legacy systems and older applications that have not yet migrated to newer alternatives like XML Schema or JSON Schema. It can also be found in some specific industries or domains that have standardized on DTDs for document validation.
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SGML had a variety of rules that made it difficult to parse correctly, and less legible than XML. XML was made to be more machine and human friendly. Both languages are otherwise remarkably similar, including DTDs and validation, as one would expect, since SGML was the ancestor of XML.
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You can in HTML 5. But according to the W3C, you shouldn't.
The W3C maintains the DTDs that define the HTML language. These DTDs are obviously outside your control. Therefore, if you were to include your own tags, they'll never validate against the DTD.
However, if against my advice, you feel the absolute need to create a custom tag, the browsers (FF, Chrome, IE 7 - 9) will allow it.
To do it, you would simply add the tag to the document:
Then in the CSS, you want to normalize the tags attributes.
answer { display:block; margin:0; padding:0; ... }
Next, you have to deal with old Internet Explorer versions, which will not like this tag otherwise.
And then you can use it as you please.
NB: This isn't a particularly great idea, and I frankly don't know why you'd want to do it. I suppose there may be some validity using it internally, but what are you doing with HTML internally that requires such a bizarre tag?
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Nan Zhang has written:
'Yin shi sheng ya'
'DTDMatch'
'Yunnan chi guai tu dian' -- subject(s): Yunnan style, Food, Food habits, Chinese Cooking, Minorities
'Qi shi jing tian'
'Automatic fault seeding for Java programs'
'DTDMatch: Dynamically matching streaming documents to DTDs'
'Zhongguo ren de shen ji miao suan' -- subject(s): Anecdotes, History
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A DTD is the original type of XML schema. XML Schemas are used to formally describes the contents of an XML document. An XML schema describes the shape of the XML document, defining the data, sub elements or attributes it can contain, along with the number of times given entities can occur. A document type definition (DTD) is a set of markup declarations that define a document type for an SGML-family markup language (SGML, XML, HTML). A Document Type Definition (DTD) defines the legal building blocks of an XML document. It defines the document structure with a list of legal elements and attributes.
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In reference to computers DTD stands for document type definition. It is defined as,
"a set of markup declarations that define a document type for SGML-family markup languages (SGML, XML, HTML). DTDs use a terse formal syntax that declares precisely which elements and references may appear where in the document of the particular type, and what the elements' contents and attributes are."
- wikipedia
See links for full article
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The namespace in XML is used to prevent tag naming collisions.
Because XML is a meta-language that allows you to define your own elements and attributes, there is significant concern that both you and I might define an element with the same name. For instance, let's imagine that you've created a DTD (Document Type Definition -- the definition file of an XML language) which allows you to define where people sit in a banquet hall. Further, let's pretend I'm hosing a Poker Tournament at your banquet hall.
In both DTDs, we have an element called "table." But they mean different things. If we tried to use both DTDs together, a hot mess would ensue. You're data type wouldn't validate against my DTD, and vice versa.
So we use namespaces. In XML, we use a namespace by adding the xmlns attribute (that's XML Namespace.) The attribute takes a unique URL as it's value. It's important to note that this value is simply for uniqueness (in other words, it doesn't have to exist. The XML parser will not go looking for it.)
I can now attach my namespace directly to my table elements:
<table xmlns:p = "http://www.example.com/pokerTable">
...
</table>
Further, I define a "prefix" which in this case is p. Now, I can use the prefix when I add a tag. For instance
<p:seat>Data</seat>
You would use a separate prefix and xlmns value, and this would keep us from stepping on each other's toes.
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Job Details:
As new data sources are acquired and existing data sources migrated to the appropriate data
environments according to the Data Acquisition plan, this position will be key in developing the means
for moving, processing and analyzing the data utilizing the recently acquired Informatica PowerCenter
toolset.
Position responsibilities:
Create and maintain stored procedures, triggers, views and constraints to support systems and
databases.
Review the requirements to assess and estimate the work effort.
Create test plans and scenarios for validation.
Work with peers to carry out design and code reviews of new development.
Assist in designing, developing and maintaining the data acquisition framework and its ETL/ELT
packages using Data Integration
Technologies, including Informatica, Netezza, and SSIS.
Contribute to architecture and design activities.
Contribute to the development and implementation of the Data Acquisition process.
Develop queries and stored procedures involving simple to complex database structures.
Document new design, development procedures or test plans as needed.
Essential skills, knowledge and abilities:
Minimum of 6 years industry experience in Software Engineering / Database Engineering / Data
Integration Engineering, meeting
deadlines, and performing software development duties.
Strong experience developing enterprise level Data Integration Framework and its packages
using Informatica product suite
(PowerCenter, PowerExchange, Netezza Pushdown).
Ability to coach and mentor others on the design, development, and usage of Informatica
product suite.
Must be capable of understanding complex data objects and data models.
Experience developing relational data models, stored procedures and software with multi-layer
architecture using SQL Server
and/or Netezza.
Experience and preference developing ETL/ELT packages using Data Integration Technologies
such as Informatica, Netezza, and
SSIS.
Experience with object-oriented design and development principles.
Experience with XML DTDs and XML Schemas.
Experience developing workflows involving various network protocols (e.g., FTP, HTTP, web
services).
Ability to work in a fast-paced, team oriented environment.
Ability to complete the full lifecycle of software development and deliver on time.
Ability to work with end users to gather requirements and convert that to working documents.
Strong interpersonal skills with a heads-up programming attitude.
Experience with Informatica product suite.
Strong experience with SQL Server and/or Netezza.
Experience developing workflows involving various network protocols (e.g., FTP, HTTP, web
services).
Non-essential skills, knowledge and abilities:
Experience with Agile and Scrum development process is a plus.
Experience with Informatica Data Quality is a plus.
Experience developing C# applications within a .NET framework is a plus.
Experience with automobile information is a plus.
Rgds
ARUN
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