Automated Data Collection with R: A Practical Guide to Web by Simon Munzert

By Simon Munzert

A fingers on consultant to net scraping and textual content mining for either newbies and skilled clients of R

  • Introduces basic thoughts of the most structure of the net and databases and covers HTTP, HTML, XML, JSON, SQL.
  • Provides easy concepts to question internet files and information units (XPath and standard expressions).
  • An vast set of routines are presented to consultant the reader via each one technique.
  • Explores either supervised and unsupervised concepts in addition to complex ideas resembling information scraping and textual content management.
  • Case reviews are featured all through in addition to examples for every process presented.
  • R code and solutions to workouts featured in the publication are supplied on a assisting website.

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Additional info for Automated Data Collection with R: A Practical Guide to Web Scraping and Text Mining

Example text

We call such elements empty because they do not hold any content. Otherwise they would have to be written as . It is possible to write a tag as , , or any other combination of capital and small letters, as standard HTML is not case sensitive. It is nevertheless recommended to always use small letters as in . Another feature of tags are attributes. com/—that points to another address. com/" attribute specifies the anchor. Browsers automatically format such elements by underlining the content and making it clickable.

While line breaks are ignored altogether, any number of consecutive spaces are presented as a single space. html from the book’s materials. 3 Tags and attributes HTML has plenty of legal tags and attributes, and it would go far beyond the scope of this book to talk about each and every one. Instead, we will focus on a subset of tags that are of special interest in the context of web data collection. html from the book’s materials. 1 The H in HTML The flexibility of and href The anchor tag The anchor tag is what turns HTML from just a markup language into a hypertext markup language by enabling HTML documents to link to other documents.

Defining styles outside of an HTML and assigning them via the class attribute enables the web designer to reuse styles across elements and documents. This enables developers to change a style in one single place—within the CSS file—with effects on all elements and documents using this style. So why should we care about style? First of all, one should always care about style. But second, as CSS is so handy for developers,

, , and class tags are used frequently. They thus provide structure to the HTML document that we can make use of to identify where our desired information is stored.

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