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The change detection problem is split into down from matching ancestors to their unmatched two sub problems. Good matching problem and descendants in another pass. If there is more than minimum confirming edit script problem. The one candidate for matching, XyDiff uses simple former finds a matching between the two obj ects heuristic rules to select one of them in order to of the two versions and the later computes a mini- avoid full evaluation of the candidates.

The proc- mum cost edit script. The run time of LaDiff is ess repeats for the next heaviest subtree match. The main focus of XyDiff is the speed rather than The MH-Diff algorithm on the other hand is the minimality of the generated edit operations. It based on transforming the change detection prob- utilizes XML specific information, e. The MH-Diff as good as O n log n. But the main drawback of process consists of constructing an induced graph XyDiff is that the bottom-up mapping technique from the input trees, pruning the induced graph, can completely fail if all the leaves are modified finding a minimum cost edge cover of the pruned or some structural change isolates the top and induced graph and finally using this edge cover to bottom part of the old version in the new one.

It compares the structure and The X-Diff algorithm [17] was proposed by content of the nodes to see if they are related. This Wang et al. X-Diff uses a com- 2 structured documents in O n time. The approach plete top-down mapping mechanism relying on of generating an edit script is based on the node signature, the path from the root to the given weighted matching problem and does not yield a node, when matching the nodes.

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The X-Diff algo- good result in the presence of node duplications in rithm includes three main phases: parsing and the input trees. The two XML documents are first parsed into trees 2. The hash values of root nodes of tween two XML documents based on heuristic the trees are then compared.

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If these hash values similarity measures. It computes the hash values are equal then the two trees are equivalent, other- for the nodes of both the documents using DOM- wise a minimum-cost matching is performed be- Hash [23] and then reduces the size of the two tween the two trees. Matching is done only on trees by removing identical subtrees.

With Zhang nodes with same signatures. Based on the match- and Shasha's algorithm it then generates the dif- ing the edit script is computed. X-Diff has a poly- ference between the two simplified trees.


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X- bena et al. This algorithm detects changes in two versions of XMLized relational data sets. XyDiff starts with matching the bottom of the tree will be modified, which is often nodes by matching their ID attributes. Next, the not the case with semi-structured XML docu- algorithm computes a signature and a weight for ments. Weight is the sum of the sizes of all the text nodes below cur- Consider the tree representation of an XML rent node. So the root of the two trees will end up document containing the item catalog of a hypo- with the largest weights.

Based on the priority of thetical store as given in Figure 1. The store car- the weight of the nodes, the signatures of the ries sci-fi related books and movies and the nodes between the two trees are matched, in order catalog currently contains two books titled Foun- to find the heaviest subtree match.

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The books and the ued with the numbering for the second tree with- movies are now classified under either Modern or out restarting. The text on each node gives the Classic, which pertains to a structural change. The algorithm starts with identifying largest iso- These are the content changes in the document.

Let T1 and T2 be the stop after matching the first two levels of the tree tree representation of the two XML documents.

The number of nodes in T is n and T is n. The and report the rest of it as unmatched. On the 1 1 2 2 other hand a bottom-up mapping like XyDiff will mapping from T1 to T2 is given by a set M of or- report the DVDs as unmatched although the struc- dered pairs x , y , where x is a node of T1 and y is a node of T. M is an isolated tree fragment map- ture of the DVD remained the same.

It will also 2 ping, if for all x , y , x , y a fragment of T rooted miss the top two levels of the tree that remained 1 1 2 2 1 unchanged. The proposed diffX algorithm per- at x 1 matches with a fragment of T2 rooted at x2 forms an isolated tree fragment mapping to iden- and a fragment of T1 rooted at y 1 matches with a fragment of T rooted at y ; then the there will be tify the largest matching fragments between the 2 2 two trees starting from the root of the older tree no overlapping between the matching tree frag- ments rooted at x and y and also at x and y.

The goal is to ensure The algorithm works as follows: In the top- a maximum matching in presence of changes in down level-order traversal of T , find all the nodes 1 both the structure and the content of the document. For each 2 1 matching node in T , recursively check for match- 2 3. The nodes of the The node of T2 that gives the largest matching tree tree are labeled and typed. The three main types fragment is added to the mapping M along with all of nodes are element, attribute and text. An the matched children.

In case of a tie, priority can element has a name and may consist of a number be given to nodes with matching parents and then of ordered sub-elements, a number of unordered the node with lower identifier value.

With multiple dictionaries, all specified dictionaries are consulted and results are interleaved. Collations are created with combinations from the different spellcheckers, with care taken that multiple overlapping corrections do not occur in the same collation. Turns on or off SpellCheck suggestions for the request. If true , then spelling suggestions will be generated. Causes Solr to build a new query based on the best suggestion for each term in the submitted query. This parameter specifies the number of collation possibilities for Solr to try before giving up.

This parameter specifies the maximum number of word correction combinations to rank and evaluate prior to deciding which collation candidates to test against the index. If true, returns an expanded response detailing the collations found.

If spellcheck. Causes Solr to return additional information about spellcheck results, such as the frequency of each original term in the index origFreq as well as the frequency of each suggestion in the index frequency. Note that this result format differs from the non-extended one as the returned suggestion for a word is actually an array of lists, where each list holds the suggested term and its frequency.

Limits spellcheck responses to queries that are more popular than the original query. The maximum number of hits the request can return in order to both generate spelling suggestions and set the "correctlySpelled" element to "false". This parameter turns on SpellCheck suggestions for the request.

This parameter specifies the query to spellcheck. The spellcheck. If the q parameter is specified, then the SpellingQueryConverter class is used to parse it into tokens; otherwise the WhitespaceTokenizer is used. The choice of which one to use is up to the application. Essentially, if you have a spelling "ready" version in your application, then it is probably better to use spellcheck.

diffX: an algorithm to detect changes in multi-version XML documents

Otherwise, if you just want Solr to do the job, use the q parameter. In this case, you have either to use spellcheck. If set to true , this parameter creates the dictionary that the SolrSpellChecker will use for spell-checking. In a typical search application, you will need to build the dictionary before using the SolrSpellChecker.

Spell Checking | Apache Solr Reference Guide

For example, you can configure the spellchecker to use a dictionary that already exists. The dictionary will take some time to build, so this parameter should not be sent with every request. If set to true, this parameter reloads the spellchecker.