Indexing is understood as the process of detailed description of the content of a writing or document, mainly extracting keywords that adequately represent the text. Its main use is when files are to be retrieved or searched within a retrieval system, organization or warehouse, to reduce search and dissemination time. It is moderated under the ISO 5963 standard, imposed in 1985. Specifically, a kind of index is elaborated that helps for each document, which not only contains words of great importance within the content, but also summaries of the same are included. that the breakdownor analysis of the topic. Similarly, it is governed by a policy, which may vary depending on the institution that employs it, although these are always portrayed in special manuals for them.
In the As in many processes including classification and analysis of documents, it consists of several stages, as are read thoroughly the issue that is within the document; choose the essential points on the topic; break down the chosen concepts with specific words, or place it under a controlled vocabulary; finally, connections are established between the terms finally extracted from the text. Therefore, free indexing is the process in which a summary with key terms of a document is presented, with the difference that this, in the phase of placing it under a controlled vocabulary, this is not used, but the words are proposed by the subject who performs the activity or are taken directly from the document.
