Help

SEARCHING

Text search

The text search can be accessed from any page on the site and is located at the top right corner. Type in your search terms, then click on the magnifying glass symbol. This search is carried out on the full text of the documents.

SEARCHING

Advanced search

The advanced / fields search is available at the top menu of the page, below the Search button.

The structured search form allows you to search the Digital Library using the Title, Author, Keyword (in bibliographic data) and Access Rights fields, and also to use the boolean operators "And", "Or" and "No".

If you want to search by other fields, you can also add one or more of the following, under [+] Add a search field:

• Location city (Place of Publication)
• Publisher
• Note field (searches in the notes fields of bibliographic data)
• Abstract field (searches in the abstract fields of bibliographic data)
• Language
• Full text (searches the full text of documents)
• Bookmarks (searches the titles of chapters or parts of works)

The search is done by word in any part of the document or bibliographic data. If you want to search for an exact expression, that expression should be put in inverted commas.

For example:

• Search expression         Gruta de Macau
• Returns all results containing the words "Gruta" or "Macau".

• Search expression         “Gruta de Macau”
• Returns only the results that contain the exact expression "Gruta de Macau".

SEARCHING

Search results

Search results are presented as a list. You will also see a column of filters to the right which allows you to refine your results.

In the filtering features, you can select whether you want to get all the matches in the text of the document, or the matches in the bookmarks (chapters or parts of the work). This selection is made at the top right-hand side, under "Include Fulltext / Include bookmarks".

You can also set up how the list is displayed using the functions available at the top of the list, e.g.:

- Number of results displayed per page (10, 20 or 50);

- Sorting results, which can be done by date of availability on the BND, by title or by date of publication;

- Browsing mode - classic list, mosaic or timeline.

SEARCHING

Record display page

The record display page includes various functions for sharing and accessing the digital resource, as well as information on copyright:

The record display page for periodicals will contain, additionally, the functionality of browsing by dates and/or issues.

ACCESSING THE DOCUMENTS

The digital resource in IIIF can be accessed from the record display page by clicking on the thumbnail or See online.

ACCESSING THE DOCUMENTS

Navigation

	Go to previous document in the list
	Go to next document in the list
	See previous page
	See next page

ACCESSING THE DOCUMENTS

Visualisation

	View single page
	View double pages (flip)
	View Thumbnails
	View facing pages in vertical sequence

Zoom

	Zoom out
	Zoom in

ACCESSING THE DOCUMENTS

Other features

	View bibliographic information
	Print or download files
	Share and send by email
	Compare documents selected by the user
	Search for text in the document
	Show OCR text
	Reverse document colours
	Adjust the contrast
	Rotate
	Show / hide information box
	Optimized zoom

ACCESSING THE DOCUMENTS

Text mode and OCR

The OCR (optical character recognition) technique makes it possible to locate and recognise strings of characters in an image and thus convert them into words that can be used for various purposes, including the full-text search offered by the National Digital Library.

This conversion is carried out automatically by the OCR software, without human correction/intervention. Although OCR techniques are constantly being improved, the quality of recognition still depends on a large number of factors related both to the original document - state of the support, ink, fonts or old spellings - and to the digitisation itself.

In addition, digitisation technique (black and white, from microfilm) can also have a negative impact on OCR performance.

DOWNLOADING DOCUMENTS

The NDL allows you to download documents that are not protected by copyright. You can download the selected document by using the Download icon.

Download formats

Documents can be downloaded in the following formats:

PDF – complete or selected page

JPG – entire page or selected part

You can also download the pdf file from the record display page.

RIGHTS AND USE

All documents available at the NLP are labelled as Protected (Interno) or Free (Livre).

Documents labelled as Interno are protected by copyright, therefore they can only be accessed from the National Library of Portugal's internal network, and the ability to download the document is inhibited.

The information on copyright is clarified at the end of the record display page, and also in the bibliographical data.