REQUIREMENT: Submit an Assignment REPORT that shows your initial XML and DTD with at least 2 RECORDS and then proceed to modify the XML and DTD and clearly document your changes at each stop. You can include the same files in your Report. Include any output from Web Based validation tool. For the 1^st exercise (ONLY) write/show the corresponding XSD and/or XSL as well as an XSLT (XML Schema Transformation) to display at least 2 records to the output in HTML through a browser.Include any output displayed in a Web Browser.

Consider the following CONSTRAINTS when during your XML validation:

The number of flours should be limited to: 1, 2 or 3

Siding should be limited to: brick or vinyl

All other fields should be Character Data or Parsed Character Data (CDATA or PCDATA)

Create an XML document with the following sample real estate data

Root element real-estate will contain a sequence of sub-elements: agencies, owners, properties and flats, all with an empty content

Ensure well-formedness

Create an internal DTD for the previous XML document

Ensure its validity

Then try to break it with invalid field data

Move the previous DTD to an external file and validate the XML document again

Extend the previous DTD such thatElements agencies, owners, properties and flats can now contain particular agency, owner, property and flat elements respectively

Agency = name, e-mail, phone

Owner = name

Property = name, description, number of flats, features, owner reference

Flat = name, description, features, property reference

Use attributes for references, otherwise elements

Use only CDATA and #PCDATA for content and values

Extend the XML document such that it contains 1 sample agency, 1 owner, 1 property, and 2 flats

Ensure well-formedness and validity

Modify both the DTD and XML:Description of properties

may now contain a text with references to flats

Description of flats

Now contains a structured description with an arbitrary, but still well-formed XML fragment

Extend both the DTD and XML:Agencies, owners and properties must now have right one address (directly after their name)Each address consists of:

Street and number

Postal code

State

Country

Respect the order, but note also that country is optional and when missing, postal code must be placed at the end (i.e. after state and not before)

Modify both the DTD and XML:

Address, e-mail and phone records of agencies may now be specified in an arbitrary order

Ensure that there are at least 2 flats

If features (of properties and flats) are specified, then at least 2 and at most 5 of them are provided

Extend both the DTD and XML:

Flats can now be associated with internal records

Each record contains

Date and additional textual information, or

sequence of at least one nested record

Modify and extend both the DTD and XML:

Add language attribute to the root element

The value needs to be fixed to EN

Add comfort level attribute to flats

Only A, B, C, D, E or F values are allowed

F is the default value

References to owners of properties are now optional