Building a semantic analysis tool for content architecture and internal linking

Problem

Large websites grow by addition. A team publishes a page whenever a topic seems relevant, and over the years the site collects hundreds or thousands of URLs. Each page is reviewed on its own, and each one looks reasonable when examined individually.

The contradiction is that the structure of a site cannot be seen by looking at pages one at a time. Overlapping and near-duplicate content builds up without notice, topical coverage develops gaps, pages compete for the same searches, internal links connect pages by habit instead of by meaning, and content silos form without anyone choosing them. What happens to search visibility when a site no longer has a clear picture of how its own pages relate to each other? And how can a team decide what to write next, or what to merge, when the relationships between pages cannot be measured?

Action

The better approach is to examine the website as a whole, and to describe its structure in terms that can be measured. I built a semantic analysis application that evaluates an entire website at sitemap level.

The application loads URLs from a sitemap, extracts and prepares the content of each page, and uses LDA topic modelling to identify the themes that recur across the site. It calculates cosine similarity using TF-IDF, which gives each pair of pages a score for how closely their wording matches, and it builds a semantic network of related pages that can be explored interactively. It also exports similarity matrices, topic assignments, graph edges and network-depth data, so the analysis can be used outside the interface instead of staying inside it. The aim was to turn a website from a collection of pages into a measurable semantic graph that supports content and SEO decisions.

Result

The application provides one workflow for identifying semantically related pages, potential duplicate or overlapping content, content gaps, internal-link opportunities, topical clusters and silos, and the broader structure of the site.

The lesson

A website is a system of relationships, and those relationships are easy to neglect because they do not belong to any single page. Before publishing more content, it is worth measuring how the existing content is connected, since new pages inherit whatever structure is already there.